| Sr. No. | Impurity name | CAS No. | Chemical structure |
| 1 | N-Nitrosomorpholine | 59-89-2 |  |
| 2 | N-Nitrosodiethanolamine | 1116-54-7 |  |
| 3 | N-Nitrosodimethylamine (NDMA) | 62-75-9 |  |
| 4 | N- Nitrosodiethylamine | 55-18-5 |  |
| 5 | N - Nitrosomethylphenylamine | 614-00-6 |  |
| 6 | N- Nitrosodiisopropylamine | 601-77-4 |  |
| 7 | N- Nitrosoisopropylethylamine | 16339-04-1 |  |
| 8 | N- Nitrosodibutylamine | 924-16-3 |  |
| 9 | N-Nitroso-N-Methyl - 4 - amino butyric acid | 61445-55-4 |  |
| 10 | Nitroso Sitagliptin -1 | 1481965-39-2 |  |
| 11 | N-Nitroso-Loperamide EP Impurity C | 3192-36-7 |  |
| 12 | 1-[(4-Chlorophenyl)phenylmethyl]-4-nitrosopiperazine | 2005-04-1 |  |
| 13 | N-Nitroso Vibegron | Not available |  |
| 14 | Nitroso Verapamil Impurity B | Not available |  |
| 15 | N-Nitroso Verapamil Impurity 2 | Not available |  |
| 16 | N-Nitroso Verapamil Impurity 3 | Not available |  |
| 17 | N-Nitroso Verapamil Impurity 4 | Not available |  |
| 18 | N-Nitroso Verapamil Impurity 5 | Not available |  |
| 19 | N-Methyl-N’-nitrosopiperazine | 16339-07-4 |  |
| 20 | Pemafibrate Nitroso Impurity-I | Not available |  |
| 21 | N-Nitroso boc-piperazine | 877177-42-9 |  |
| 22 | N-Nitroso benzonatate | Not available |  |
| 23 | N-Nitroso ambroxol | Not available |  |
| 24 | Ethyl 4-(butylnitrosoamino)benzoate | 101265-45-6 |  |
| 25 | Tofacitinib Nitroso Impurity-I | Not available |  |
| 26 | Tofacitinib Nitroso Impurity-II | Not available |  |
| 27 | 1-Cyclopentyl-4-nitrosopiperazine | 61379-66-6 |  |
| 28 | 1-Cyclohexyl-4-nitrosopiperazine | Not available |  |
| 29 | N-Nitroso piperidine | 100-75-4 |  |
| 30 | 1-nitrosopiperazine | 5632-47-3 |  |
| 31 | 1,4-dinitrosopiperazine | 140-79-4 |  |
| 32 | 4-(Nitrosomethylamino) pyridine | 16219-99-1 |  |
| 33 | N-Nitroso pyrrolidine | 930-55-2 |  |
| 34 | 4-(Diphenylmethyl)-1-nitrosopiperidine | 94067-39-7 |  |
| 35 | N-Nitroso moxifloxacin | Not available |  |
| 36 | Moxifloxacin nitroso impurity-2 | Not available |  |
| 37 | Moxifloxacin nitroso impurity-3 | Not available |  |
| 38 | Moxifloxacin nitroso impurity-4 | Not available |  |
| 39 | Moxifloxacin nitroso impurity-5 | Not available |  |
| 40 | Moxifloxacin nitroso impurity-6 | Not available |  |
| 41 | N-desmethyl-n-nitroso sildenafil | Not available |  |
| 42 | 1-(3-Chlorophenyl)-4-nitrosopiperazine | 2219339-13-4 |  |
| 43 | Piperazine, 1-(2,3-dichlorophenyl)-4-nitroso- (Aripiprazole nitroso impurity-1) |
2989508-28-1 |  |
| 44 | Mebeverine nitroso impurity-1 | Not available |  |
| 45 | Mebeverine nitroso impurity-2 | Not available |  |
| 46 | Mebeverine nitroso impurity-3 | Not available |  |
| 47 | N-Nitroso vortioxetine | 2925447-38-5 |  |
| 48 | 4-methoxybenzyl 4-nitrosopiperazine-1-carboxylate | Not available |  |
| 49 | Phenylmethyl 4-nitroso-1-piperazinecarboxylate | 161683-14-3 |  |
| 50 | Phenylmethyl hexahydro-4-nitroso-1H-1,4-diazepine-1-carboxylate | 211748-65-1 |  |
| 51 | N,N-bis(2-bromoethyl)nitrous amide | Not available |  |
| 52 | N,N-bis(2-chloroethyl)nitrous amide | Not available |  |
| 53 | 1-(2-Bromophenyl)-4-nitrosopiperazine | Not available |  |
| 54 | 1-(4-Bromophenyl)-4-nitrosopiperazine | 2648941-13-1 |  |
| 55 | 1-(2-Chlorophenyl)-4-nitrosopiperazine | 2221987-86-4 |  |
| 56 | 1-(2-Fluorophenyl)-4-nitrosopiperazine | 2731009-71-3 |  |
| 57 | 1-(4-Chlorophenyl)-4-nitrosopiperazine | 873395-52-9 |  |
| 58 | 1-(3-Chlorophenyl)-4-nitrosopiperazine | 2219339-13-4 |  |
| 59 | 1-(2-Methylphenyl)-4-nitrosopiperazine | 2751615-89-9 |  |
| 60 | 4-(1-Nitroso-4-piperidinyl)morpholine | 2089333-06-0 |  |
| 61 | 7-Nitroso-3-(trifluoromethyl)-5,6,7,8-tetrahydro[1,2,4]triazolo-[4,3-a]pyrazine (NTTP) | 2892260-32-9 |  |
| 62 | N-nitroso-1,2,3,6-tetrahydropyridine (NTHP) | 55556-92-8 |  |
| 63 | N-nitroso-varenicline | 2755871-02-2 |  |
| 64 | N-nitroso-duloxetine | 2680527-91-5 |  |
| 65 | N-nitroso-fluoxetine | 150494-06-7 |  |
| 66 | N-Nitroso-atomoxetine | Not available |  |
| 67 | N-Nitroso atomoxetine EP Impurity-A | Not available |  |
| 68 | N-Nitroso atomoxetine EP Impurity-B / N-Nitroso USP Atomoxetine S-Isomer |
Not available |  |
| 69 | N-Nitroso atomoxetine EP Impurity-C | Not available |  |
| 70 | N-Nitroso atomoxetine EP Impurity-D / N-Nitroso Atomoxetine USP Related Compound B |
Not available |  |
| 71 | N-Nitroso atomoxetine EP Impurity-F | Not available |  |
| 72 | N,N-Dinitroso atomoxetine EP Impurity-G | Not available |  |
| 73 | Mononitroso atomoxetine EP Impurity-G | Not available |  |
| 74 | N-Nitroso atomoxetine EP Impurity-H | Not available |  |
| 75 | N-Desmethyl-N-Nitroso olanzapine | Not available |  |
| 76 | N-[2-(2,6-Dimethylphenoxy)ethyl]-N-nitrosobenzenemethanamine | 2348-58-5 |  |
| 77 | 2-(Diphenylmethoxy)-N-methyl-N-nitrosoethanamine | 55855-43-1 |  |
| 78 | N-Nitroso-N-desmethyl prochlorperazine | 109095-35-4; 856996-47-9 [Maleate salt] |
 |
| 79 | N-Nitroso-N-desmethyl prochlorperazine sulfoxide | Not available |  |
| 80 | 4-(methylnitrosoamino)-1-(3-pyridinyl)-1-butanone (NNK) | 64091-91-4 |  |
| 81 | N-Nitrosopropranolol | 84418-35-9 |  |
| 82 | N-Nitroso-N-Desmethyl Dapoxetine | Not available |  |
| 83 | Nitroso Derivative of Prucalopride Impurity A | Not available |  |
| 84 | N-Nitroso prucalopride Impurity-2 | 2396758-93-1 |  |
| 85 | N-Nitroso-N-Desmethyl Mirtazapine | Not available |  |
| 86 | N-Nitroso N-Desethyl metoclopramide | Not available |  |
| 87 | N-Nitrosodesmethyl chlorpromazine | 55855-44-2 |  |
| 88 | N-Nitroso Levofloxacin Related Compound-A (or) N-Nitroso N-Desmethyl levofloxacin |
1152314-62-9 |  |
| 89 | Ibrutinib nitroso impurity-1 | 2256059-43-3 |  |
| 90 | 1-Nitroso-3-piperidinol | 55556-85-9 |  |
| 91 | (3S)-1-Nitroso-3-piperidinol | 2380680-64-6 |  |
| 92 | 3-Bromo-1-(1-nitroso-4-piperidinyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine | 2120391-57-1 |  |
| 93 | 3-Iodo-1-(1-nitroso-4-piperidinyl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine | Not available |  |
| 94 | N-Nitroso Bis(2-chloroethyl)amine | 67856-68-2 |  |
| 95 | 1-((4-Chlorophenyl) (phenyl)methyl)-4-nitroso piperazine (or) Cetirizine N-Nitroso Impurity |
2005-04-1 |  |
| 96 | 1-(4-Methoxyphenyl)-4-nitroso piperazine (or) N-Nitroso Itraconazole Impurity-1 |
75051-59-1 |
 |
| 97 | N-Nitroso Enzalutamide Impurity-1 | Not available |  |
| 98 | 2-(1-nitrosopiperidin-4-yl)-2-phenylacetic acid | 2624121-90-8 |  |
| 99 | N-Nitroso Desmethyl Carbinoxamine | Not available |  |
| 100 | N-Nitroso-2-hydroxymethyl atomoxetine | Not available |  |
| 101 | N-Nitroso 4'-hydroxy atomoxetine | Not available |  |
| 102 | 1-(Methylnitrosoamino) methanol | 58840-25-8 |  |
| 103 | N-Nitroso-4-(4-Bromophenyl) piperidin-4-ol (Bromperidol Nitroso impurity-1) |
Not available |  |
| 104 | N-Nitroso-4-Hydroxy-4-phenylpiperidine (Bromperidol Nitroso impurity-2) |
Not available |  |
| 105 | N-Nitroso-4-(4-Bromophenyl)-1,2,3,6-tetrahydropyridine (Bromperidol Nitroso impurity-3) | Not available |  |
| 106 | N-Nitroso N-Desmethyl Citalopram | Not available |  |
| 107 | N-Nitroso Desmethyl Amitriptyline | Not available |  |
| 108 | N-Nitroso Nortriptyline | 55855-42-0 |  |
| 109 | N-Nitroso Norcyclobenzaprine | Not available |  |
| 110 | 4-(5H-Dibenzo[a,d]cyclohepten-5-ylidene)-1-nitrosopiperidine (or) N-Nitroso-N-Desmethyl Cyproheptadine | 3979-11-1 |  |
| 111 | N-Nitroso Norcyclobenzaprine | Not available |  |
| 112 | N-Nitroso-4-(3-Piperidinyl)benzenamine | Not available |  |
| 113 | N-ethyl-N-Nitrosopiperazine | 65504-33-8 |  |
| 114 | 1-[(4-Chlorophenyl)methyl]-4-nitrosopiperazine | 3973-67-9 |  |
| 115 | N-Nitroso solifenacin impurity-A | 2659259-64-8 |  |
| 116 | Apixaban nitroso impurity-1 | Not available |  |
| 117 | N-Nitroso timolol impurity | Not available |  |
| 117 | Brexpiprazole nitroso impurity | 2639426-95-0 |  |
| 118 | N-Nitroso N-Desethyl Metoclopramide | Not available |  |
| 119 | Formoterol Nitroso Impurity | Not available |  |
| 120 | N-Nitrosodesmethyl chlorpromazine | 55855-44-2 |  |
| 121 | N-Nitroso N-Desmethyl Doxylamine | Not available |  |
| 122 | N-Nitroso Gefitinib | Not available |  |
| 123 | Gefitinib nitroso impurity-1 | Not available |  |
| 124 | Gefitinib nitroso impurity-2 | Not available |  |
| 125 | 2-Pyridinamine, N-nitroso-N-phenyl- | 6631-38-5 |  |
| 126 | 2-ethylhexyl 4-[methyl(nitroso) amino]benzoate | 122021-01-6 |  |
| 127 | N-Nitroso vonoprazan | 2932441-73-9 |  |
| 128 | [5-Chloro-2-(methylnitrosoamino)phenyl]phenylmethanone; N-Nitroso Temazepam EP Impurity A |
51145-18-7 |  |
| 129 | 1-Benzhydryl-4-nitrosopiperazine | 1698-25-5 |  |
| 130 | 1-(2-nitrophenyl)-4-nitrosopiperazine | Not available |  |
| 131 | N-Nitroso elacestrant | Not available |  |
| 132 | N-Nitroso ribociclib | Not available |  |
| 133 | N-Nitroso N-Desmethyl DEBA | Not available |  |
| 134 | N-Nitroso N-Desmethyl Ivabradine | 3017270-16-2 |  |
| 135 | Ivabradine nitroso impurity-I | Not available |  |
| 136 | N-Nitroso ribociclib -2 | Not available |  |
| 137 | Ethyl 1-nitroso-4-piperidinecarboxylate | 160114-74-9; 857364-00-2 (HCl salt) |
 |
| 138 | 1-Nitroso-3-azetidine carboxylic acid | 102624-97-5 |  |
| 139 | N-Nitroso-L-azetidine carboxylic acid ethyl ester | 31183-41-2 |  |
| 140 | 3-Hydroxy-N-nitrosopyrrolidine | 56222-35-6 |  |
| 141 | N-nitroso-L-pipecolic acid | 30310-83-9 |  |
| 142 | N-nitrosoproline | 2571-28-0 |  |
| 143 | N-Nitroso-D-pipecolic acid | 30310-84-0 |  |
| 144 | N-nitrososarcosine | 55332-68-8 |  |
| 145 | N-nitrososarcosine methyl ester | 51938-19-3 |  |
| 146 | N-nitrososarcosine ethyl ester | 13344-50-8 |  |
| 147 | 1-nitroso-piperidine-2-carboxylic acid | 4515-18-8 |  |
| 148 | 1-Nitrosonipecotic acid | 65445-62-7 |  |
| 149 | 1-nitroso-piperidine-4-carboxylic acid | 6238-69-3 |  |
| 150 | N-nitrosoazetidine-2-carboxylic acid | 30248-47-6 |  |
| 151 | N-nitroso-trans-4-hydroxy-L-proline | 30310-80-6 |  |
| 152 | Trientine mononitroso impurity | 2817316-41-7 |  |
| 153 | Trientine dinitroso impurity | Not available |  |
| 154 | N1-(2-Aminoethyl)-N1-nitroso-1,2-ethanediamine | 741659-46-1; 239096-66-3 [HCl salt] |
 |
| 155 | N-Nitroso Methotrexate EP impurity B | Not available |  |
| 156 | N-Nitroso Methotrexate EP impurity L | Not available |  |
| 157 | N-Nitroso Dimethyl (4-(methylamino)benzoyl) glutamate | Not available |  |
| 158 | N-Nitroso Desethyl Dicycloverine | Not available |  |
| 159 | N-Methyl-n-benzylnitrosamine | 937-40-6 |  |
| 160 | Clopidogrel Nitroso Impurity | 2460755-43-3 |  |
| 161 | N-Nitroso meglumine | 10356-92-0 |  |
| 162 | 1,1-Dimethylethyl N-(1-nitroso-3-piperidinyl)carbamate | 1973427-27-8 |  |
| 163 | 1-Nitrosopiperidin-3-amine | 2819242-71-0 |  |
| 164 | N-(2-Hydroxyethyl)-N-phenylnitrous amide | 25413-76-7 |  |
| 165 | 2-[Nitroso(phenylmethyl)amino] benzoic acid | 1028-91-7 |  |
| 166 | 5-Nitroso-5H-dibenzo[b,f]azepine | 38652-29-8 |  |
| 167 | Cyclopropyl(4-nitroso-1-piperazinyl)methanone | 2742659-60-3 |  |
| 168 | N1,N3-Dimethyl-N1-nitroso-1,3-propanediamine | 29104-70-9 |  |
| 169 | N1-(1-Methylethyl)-N1-nitroso-1,3-propanediamine | 1689539-03-4 |  |
| 170 | N1-(3-Aminopropyl)-N1-nitroso-1,4-butanediamine | 78249-62-4 |  |
| 171 | N1,N1,N3-Trimethyl-N3-nitroso-1,3-propanediamine | 2731010-51-6 |  |
| 172 | N1,N3-Dimethyl-N1,N3-dinitroso-1,3-propanediamine | 6972-76-5 |  |
| 173 | N-Nitroso-L-proline | 7519-36-0 |  |
| 174 | 1-(Benzo[b]thiophen-4-yl)-4-nitrosopiperazine | 2639426-95-0 |  |
| 175 | 1-(Benzo[b]thiophen-4-yl)-4-nitrosopiperazine | 2639426-95-0 |  |
| 176 | N-Nitroso despiramine (or) N-Nitroso-N-Desmethyl Imipramine |
57164-17-7 |  |
| 177 | N-Nitroso-N-Desmethyl clopiramine | Not available |  |
| 178 | 3-Chloro-5-nitroso-5H-dibenzo[b,f]azepine | 959007-11-5 |  |
| 179 | 3-Chloro-5-nitroso-10,11-dihydro-5H-dibenzo[b,f]azepine | 78213-40-8 |  |
| 180 | 3,7-Dichloro-5-nitroso-10,11-dihydro-5H-dibenzo[b,f]azepine | 41075-14-3 |  |
| 181 | N-nitroso-quinapril | 2922985-13-3 |  |
| 182 | N-Nitroso Amoxapine | Not available |  |
| 183 | N-Nitroso Morniflumate | Not available |  |
| 184 | 2-[Nitroso[3-(trifluoromethyl)phenyl]amino]benzoic acid | 23595-00-8 |  |
| 185 | N-Nitroso Propafenone | NA |  |
| 186 | N-Nitroso hydralazine | Not available |  |
| 187 | N-Nitroso epinephrine | 3006789-99-4 |  |
| 188 | allyl 2-((3-fluoro-4-(methylcarbamoyl)phenyl)(nitroso)amino)-2-methylpropanoate N-Nitroso Enzalutamide impurity-1 |
Not available |  |
| 189 | 2-((3-fluoro-4-(methylcarbamoyl)-phenyl)-(nitroso)amino)-2-methyl-propanoicacid N-Nitroso Enzalutamide impurity-2 |
Not available |  |
| 190 | N-Nitroso dibenzylamine | 5336-53-8 |  |
| 191 | 1-(1-nitrosopiperidin-4-yl)-1,3-dihydro-2H-benzo[d]imidazol-2-one Nitroso impurity for Benperidol and Pimozide |
Not available |  |
| 192 | N-Nitroso-bis ( 2-hydroxypropylamine) | 53609-64-6 |  |
| 193 | N-Nitroso ciprofloxacin | 864443-44-7 |  |
| 194 | N-Nitroso-N-Desmethyl tetracaine | Not available |  |
| 195 | N-Nitroso tetracaine | Not available |  |
| 196 | N-Nitroso Lidocaine EP Impurity E | Not available |  |
| 197 | N-Nitroso N-Desmethyl Mirtazapine | Not available |  |
| 198 | Glycopyrrolate Nitroso Impurity-1 | Not available |  |
| 199 | N-Nitroso perindopril | Not available |  |
| 200 | N-Nitroso perindopril impurity A | 2912492-21-6 |  |
| 201 | N-Nitroso perindopril impurity B | Not available |  |
| 202 | N-Nitroso perindopril impurity E | Not available |  |
| 203 | N-Nitroso perindopril impurity I | Not available |  |
| 204 | 1,2-Ethanediamine, N1,N2-dinitroso-N1,N2-bis(phenylmethyl)- | 69239-61-8 |  |
| 205 | N-Nitroso-N,N'-dibenzylethanediamine | Not available |  |
| 206 | N-Nitroso N-Methyl Valacyclovir | Not available |  |
| 207 | N-Nitroso N-Ethyl Valacyclovir | Not available |  |
| 208 | N-Nitroso degarelix | Not available |
NA |
| 209 | Prucalopride Nitroso impurity-2; N-Nitroso-4-aminopiperidine | Not available |  |
| 210 | 4-(1-Nitroso-4-piperidinyl)morpholine | 2089333-06-0 |  |
| 211 | 3-(4-nitrosopiperazin-1-yl)benzo[d]isothiazole Lurasidone and Ziprasidone nitroso impurity |
Not available |  |
| 212 | N-Methyl-N-nitroso-1-naphthalenemethanamine (Terbinafine nitroso impurity-1) |
296760-88-8 |  |
| 213 | N-Nitroso N-Desmethyl Terbinafine | Not available |  |
| 214 | N-(1-Naphthalenylmethyl)-N-nitroso-1-naphthalenemethanamine (Terbinafine nitroso impurity-2) |
854390-56-0 |  |
| 215 | N-Nitroso-N-desmethyl imatinib | 2816369-80-7 |  |
| 216 | Ethanol, 2-[2-(4-nitroso-1-piperazinyl)ethoxy] | 73486-81-4 |  |
| 217 | 4-Nitroso-1-piperazineethanol | 48121-20-6 |  |
| 218 | N-(2-aminoethyl)-N-(2-hydroxyethyl) nitrous amide | Not available |  |
| 219 | 2-(4-nitrosopiperazin-1-yl)ethan-1-amine | Not available |  |
| 220 | N-Nitroso Sertraline | 3006789-98-3 |  |
| 221 | N-Nitroso Sertraline EP impurity-A; N-Nitroso Sertraline USP Related compound A | Not available |  |
| 222 | N-Nitroso Sertraline EP Impurity-B; N-Nitroso 2,3-Deschlorosertraline | Not available |  |
| 223 | N-Nitroso Sertraline EP Impurity-C; N-Nitroso 3-Deschlorosertraline | Not available |  |
| 224 | N-Nitroso Sertraline EP Impurity-D; N-Nitroso 4-Deschlorosertraline | Not available |  |
| 225 | N-Nitroso 2,3-Isosertraline | Not available |  |
| 226 | N-Nitroso N-Desmethyl Zolmitriptan | Not available |  |
| 227 | N-Nitroso Viloxazine | Not available |  |
| 228 | 2-[Nitroso(phenylmethyl)amino] ethanol | 77817-40-4 |  |
| 229 | N-Nitroso-2-Morpholinemethanol | Not available |  |
| 230 | Pemafibrate Nitroso Impurity-II | Not available |  |
| 231 | Pemafibrate Nitroso Impurity-III | Not available |  |
| 232 | Pemafibrate Nitroso Impurity-IV | Not available |  |
| 233 | N-Nitroso Anagrelide Related Compound-A | Not available |  |
| 234 | Ethyl N-(2,3-dichloro-6-nitrobenzyl)-N-nitrosoglycinate | Not available |  |
| 235 | N-Nitroso Dorzolamide | Not available |  |
| 236 | N-Nitroso Rasagiline | 2470278-90-9 |  |
| 237 | Rasagiline Nitroso impurity-I | 2667609-96-1 |  |
| 238 | Rasagiline Nitroso impurity-II | Not available |  |
| 239 | Benzoic acid, 4-(methylnitrosoamino)-, 2-ethylhexyl ester | 122021-01-6 |  |
| 240 | N-Nitroso-N-(phenylmethyl)-2-pyridinamine | 13980-62-6 |  |
| 241 | N-Nitroso dasatinib impurity-1 | 2135905-86-9 |  |
| 242 | 1-(5-Chloro-2-pyridinyl)-4-nitrosopiperazine | 1082404-28-1 |  |
| 243 | 4-chloro-2-methyl-6-(4-nitrosopiperazin-1-yl)pyrimidine | Not available |  |
| 244 | Fezolinetant Nitroso Impurity-I | Not available |  |
| 245 | Fezolinetant Nitroso Impurity-I | Not available |  |
| 246 | N-Nitroso Bupropion | 2763780-10-3 |  |
| 247 | N-Nitroso Deschloro Bupropion | Not available |  |
| 248 | N-Nitroso o-Bupropion | Not available |  |
| 249 | N-Nitroso Bupropion Related Compound A | Not available |  |
| 250 | N-Nitroso Bupropion Related Compound B | Not available |  |
| 251 | N-Nitroso-4-Chlorobupropion | Not available |  |
| 252 | N-Nitroso-5-Chlorobupropion | Not available |  |
| 253 | N-Nitroso Aripiprazole Desethylene Impurity | Not available |  |
| 254 | N-Nitroso Enzalutamide Impurity-D | Not available |  |
| 255 | 4-Nitroso-1-piperazinecarboxaldehyde | 2455384-08-2 |  |
| 256 | N-Nitroso-p-Chloro-Benzylamino-Pyridine (N-CBAP) | Not available |  |
| 257 | N-Nitroso Metolazone | Not available |  |
| 258 | N-Nitroso-Metolazone EP impurity A; meta-Metolazone | Not available |  |
| 259 | N-Nitroso-Metolazone EP impurity B; para-Metolazone | Not available |  |
| 260 | N-Nitroso-Metolazone EP impurity C; Desmethyl Metolazone | Not available |  |
| 261 | N-Nitroso-Alverine Citrate EP Impurity C | Not available |  |
| 262 | N-Nitroso N-Desethyl Alverine | 871884-77-4 |  |
| 263 | N-Nitroso-N-Ethylcyclohexanepropanamine | Not available |  |
| 264 | N-Nitrosoethylmethyl amine | 10595-95-6 |  |
| 265 | N- Nitroso Dipropylamine | 621-64-7 |  |
| 266 | Bilastine Nitroso Impurity 1 | 2731008-04-9 |  |
| 267 | Bilastine Nitroso Impurity 2 | Not available |  |
| 268 | N-Nitroso Vildagliptin | Not available |  |
| 269 | N-Nitroso Vildagliptin amide | Not available |  |
| 270 | N-Nitroso silodosin | Not available |  |
| 271 | N-Nitroso dehydrosilodosin | Not available |  |
| 272 | N-Nitroso silodosin nitrile | Not available |  |
| 273 | N-Nitroso O-Acetylsilodosin | Not available |  |
| 274 | N-Nitroso silodosin n-oxide | Not available |  |
| 275 |
N-Nitroso Racemic Stage I of Silodosin |
Not available |  |
| 276 | N-Nitroso Nebivolol (Mixture of isomers) | 1391051-68-5 |  |
| 277 | N-Nitroso Nebivolol EP Impurity-A | Not available |  |
| 278 | N-Nitroso Nebivolol EP Impurity-B | Not available |  |
| 279 | N-Nitroso Nebivolol EP Impurity-D | Not available |  |
| 280 | N-Nitroso Domperidone EP Impurity-A | Not available |  |
| 281 | 2H-Benzimidazol-2-one, 1,3-dihydro-1-(1-nitroso-4-piperidinyl)- | 3031791-88-2 |  |
| 282 | N-Nitroso-N-(4-Chloro-2-nitrophenyl)-4-piperidinamine | Not available |  |
| 283 | N-Nitroso Phenylephrine EP Impurity-B; N-Nitroso phenylephrone |
Not available |  |
| 284 | N-Nitroso Phenylephrine | 78658-64-7 |  |
| 285 | N-Nitroso adrenalone | Not available |  |
| 286 | N-Nitroso Terbutaline | Not available |  |
| 287 | N-Nitroso Terbutaline Impurity-C; |
Not available |  |
| 288 | N-Nitroso-N-Desmethy eletriptan | Not available |  |
| 289 | N-nitroso-desmethyl-desvenlafaxine | Not available |  |
| 290 | N-nitroso-desmethyl-venlafaxine | 2680662-11-5 |  |
| 291 | N-Desacetyl-N-Nitroso ketoconazole; N-Nitroso ketoconazole EP Impurity-D | Not available |  |
| 292 | 4-(4-nitrosopiperazin-1-yl)phenol | Not available |  |
| 293 | N-Nitroso Tamsulosin | 2892260-31-8 |  |
| 294 | 2-(4-Nitroso-1-piperazinyl) pyrimidine (N-Nitroso Buspirone Impurity-A) |
872826-80-7 |  |
| 295 | N1,N1,N2-Trimethyl-N2-nitroso-1,2-ethanediamine (Osemertinib Nitroso Impurity-1) |
23834-30-2 |  |
| 296 | N1,N2-Dimethyl-N1,N2-dinitroso-1,2-ethanediamine | 13256-12-7 |  |
| 297 | N-Nitroso Osimertinib | Not available |  |
| 298 | N-Nitroso N-Desmethyl Osimertinib-1 | Not available |  |
| 299 | N-Nitroso N-Desmethyl Osimertinib-2 | Not available |  |