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Sr No.NAME OF IMPURITYCAS NO.Molecular FormulaMolecular WeightIUPAC NAME
1N-Nitroso Abacavir141271-12-7C14H17N7O2315.34(S)-N-(2-Amino-9-(3-(hydroxymethyl)cyclopent-3-en-1-yl)-9H-purin-6-yl)-N-cyclopropylnitrous amide
2 N-Nitroso Abacavir EP Impurity A136470-79-6C14H17N7O2315.14N-(2-amino-9-((1S,4R)-4-(hydroxymethyl)cyclopent-2-en-1-yl)-9H-purin-6-yl)-N-cyclopropylnitrous amide
3N-Nitroso Abacavir Impurity 1N/AC11H13ClN6O3312.71N-(2-Amino-4-chloro-6-(((1S,4R)-4-(hydroxymethyl)cyclopent-2-en-1-yl)(nitroso)amino)pyrimidin-5-yl)formamide
4N-Nitroso Abacavir Impurity 2N/AC8H9N7O219.21N-(2-Amino-9H-purin-6-yl)-N-cyclopropylnitrous amide
5N-Nitroso Abacavir Impurity 3N/AC8H9N7O219.21N6-Cyclopropyl-9-nitroso-9H-purine-2,6-diamine
6N-Nitroso AceclofenacN/AC16H12Cl2N2O5383.22-(2-(2-((2,6-Dichlorophenyl)(nitroso)amino)phenyl)acetoxy)acetic acid
7N-Nitroso AcetylcysteineN/AC5H8N2O4S192.19N-Acetyl-N-nitroso-L-cysteine
8N-Nitroso AciclovirN/AC8H10N6O4254.212-Amino-9-((2-hydroxyethoxy)methyl)-1-nitroso-1,9-dihydro-6H-purin-6-one
9N-Nitroso Afatinib Impurity 1N/AC24H24ClFN6O4514.94(S,E)-N-(4-((3-Chloro-4-fluorophenyl)(nitroso)amino)-7-((tetrahydrofuran-3-yl)oxy)quinazolin-6-yl)-4-(dimethylamino)but-2-enamide
10N-Nitroso AlbendazoleN/AC12H14N4O3S294.33Methyl (1-nitroso-5-(propylthio)-1H-benzo[d]imidazol-2-yl)carbamate
11N-Nitroso Albendazole Impurity 1N/AC12H13N3O3S279.31Methyl 1-nitroso-5-(propylthio)-1H-benzo[d]imidazole-2-carboxylate
12N-Nitroso AlectinibN/AC30H33N5O3511.639-Ethyl-6,6-dimethyl-8-(4-morpholinopiperidin-1-yl)-5-nitroso-11-oxo-6,11-dihydro-5H-benzo[b]carbazole-3-carbonitrile
13N-Nitroso Allopurinol Impurity 1N/AC5H3N5O2165.111-Nitroso-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-one
14N-Nitroso Allopurinol Impurity 2 N/AC5H3N5O2165.119-Nitroso-9H-purin-6-ol
15N-Nitroso Almotriptan Impurity 1N/AC17H24N4O3S364.46N,N-Dimethyl-2-(1-nitroso-5-((pyrrolidin-1-ylsulfonyl)methyl)-1H-indol-3-yl)ethan-1-amine
16N-Nitroso Almotriptan EP Impurity BN/AC30H40N6O3S564.752-(5-((3-(2-(Dimethylamino)ethyl)-1-nitroso-5-((pyrrolidin-1-ylsulfonyl)methyl)-1H-indol-2-yl)methyl)-1H-indol-3-yl)-N,N-dimethylethan-1-amine
17N-Nitroso Almotriptan EP Impurity A Possibility 2N/AC16H22N4O3S350.44N-Methyl-2-(1-nitroso-5-((pyrrolidin-1-ylsulfonyl)methyl)-1H-indol-3-yl)ethan-1-amine
18N-Nitroso Almotriptan EP Impurity D N-Nitroso Almotriptan USP Related Compound B ; N-Nitroso Almotriptan Didesmethyl ImpurityN/AC15H20N4O3S336.41 2-(1-Nitroso-5-((pyrrolidin-1-ylsulfonyl)methyl)-1H-indol-3-yl)ethan-1-amine
19N-Nitroso Almotriptan EP Impurity EN/A C17H24N4O4S380.46N,N-Dimethyl-2-(1-nitroso-5-((pyrrolidin-1-ylsulfonyl)methyl)-1H-indol-3-yl)ethan-1-amine oxide
20N-Nitroso Almotriptan EP Impurity DN/AC15H20N4O3S336.412-(1-Nitroso-5-((pyrrolidin-1-ylsulfonyl)methyl)-1H-indol-3-yl)ethan-1-amine
21N-Nitroso Almotriptan EP Impurity FN/AC19H28N4O3S392.52N-Methyl-N-(2-(1-nitroso-5-((pyrrolidin-1-ylsulfonyl)methyl)-1H-indol-3-yl)ethyl)propan-2-amine
22N-Nitroso 2-HydroxyalmotriptanN/AC17H24N4O4S380.463-(2-(Dimethylamino)ethyl)-1-nitroso-5-((pyrrolidin-1-ylsulfonyl)methyl)-1H-indol-2-ol
23N-Nitroso Spiro AlmotriptanN/AC17H24N4O4S380.461\'-Methyl-1-nitroso-5-((pyrrolidin-1-ylsulfonyl)methyl)spiro[indoline-3,3\'-pyrrolidin]-2-ol
24N-Nitroso Alprazolam EP Impurity HN/AC34H26Cl2N8O3665.54N,N-bis((4-(2-benzoyl-4-chlorophenyl)-5-methyl-4H-1,2,4-triazol-3-yl)methyl)nitrous amide
25N-Nitroso AltizideN/AC11H13ClN4O5S3412.883-((Allylthio)methyl)-6-chloro-4-nitroso-3,4-dihydro-2H-benzo[e][1,2,4]thiadiazine-7-sulfonamide 1,1-dioxide
26N-Nitroso Alverine EP Impurity CN/AC11H16N2O192.26N-ethyl-N-(3-phenylpropyl)nitrous amide
27N-Nitroso N-Desethyl Alverine871884-77-4C18H22N2O282.39N,N-Bis(3-phenylpropyl)nitrous amide
28N-Nitroso-3-AminopiperidineN/AC5H11N3O129.16N-(piperidin-3-yl)nitrous amide
29N-Nitroso AmoxapineN/AC17H15ClN4O2342.792-Chloro-11-(4-nitrosopiperazin-1-yl)dibenzo[b,f][1,4]oxazepine
30N-Nitroso AmoxicillinN/AC24H25N5O8S543.55(2S,5R,6R)-6-(2-(4-Hydroxyphenyl)-2-(2-((4-hydroxyphenyl)(nitroso)amino)acetamido)acetamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid
31N-Nitroso Anagrelide USP Related Compound AN/AC11H13Cl2N3O3306.14Ethyl N-(6-amino-2,3-dichlorobenzyl)-N-nitrosoglycinate
32N-Nitroso AnagrelideN/AC11H11Cl2N3O5336.13Ethyl N-(2,3-dichloro-6-nitrobenzyl)-N-nitrosoglycinate
33 N-Nitrosoantipyrine885-11-0C11H11N3O2217.231,5-Dimethyl-4-nitroso-2-phenyl-1,2-dihydro-3H-pyrazol-3-one
34N-Nitroso Apixaban Amino AcidN/AC25H26N6O6506.525-((4-(3-Carbamoyl-1-(4-methoxyphenyl)-7-oxo-1,4,5,7-tetrahydro-6H-pyrazolo[3,4-c]pyridin-6-yl)phenyl)(nitroso)amino)pentanoic acid
35N-Nitroso Apixaban Impurity 1N/AC11H12ClN3O4285.68Ethyl (Z)-2-chloro-2-(2-(4-methoxyphenyl)-2-nitrosohydrazono)acetate
36N-Nitroso Apixaban Impurity 2N/AC27H28ClN5O6554Ethyl 6-(4-(5-chloro-N-nitrosopentanamido)phenyl)-1-(4-methoxyphenyl)-7-oxo-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxylate
37N-Nitroso Apixaban Impurity 3N/AC11H12ClN3O4285.685-((4-Nitrophenyl)(nitroso)amino)pentanoyl chloride
38N-Nitroso Apixaban Impurity 4N/AC20H25ClN4O4420.895-Chloro-N-(4-(5-morpholino-6-oxo-3,6-dihydropyridin-1(2H)-yl)phenyl)-N-nitrosopentanamide
39N-Nitroso Apixaban Impurity 5N/AC25H27N7O5505.536-(4-((5-Amino-5-oxopentyl)(nitroso)amino)phenyl)-1-(4-methoxyphenyl)-7-oxo-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxamide
40N-Nitroso Apixaban Impurity 6N/AC25H26N6O6506.523-Carbamoyl-1-(4-methoxyphenyl)-4-(2-(nitroso(4-(2-oxopiperidin-1-yl)phenyl)amino)ethyl)-1H-pyrazole-5-carboxylic acid
41N-Nitroso Aprepitant Impurity 1N/AC20H17F7N2O3466.36(2R)-2-((R)-1-(3,5-Bis(trifluoromethyl)phenyl)ethoxy)-3-(4-fluorophenyl)-4-nitrosomorpholine
42N-Nitroso Aprepitant Impurity 2N/AC20H17F7N2O3466.36(2R,3S)-2-((R)-1-(3,5-Bis(trifluoromethyl)phenyl)ethoxy)-3-(4-fluorophenyl)-4-nitrosomorpholine
43N-Nitroso Aprepitant Impurity 3N/AC20H17F7N2O3466.36(2R,3S)-2-((S)-1-(3,5-Bis(trifluoromethyl)phenyl)ethoxy)-3-(4-fluorophenyl)-4-nitrosomorpholine
44N-Nitroso Aprepitant Impurity 477817-40-4C9H12N2O2180.21N-Benzyl-N-(2-hydroxyethyl)nitrous amide
45N-Nitroso Aprepitant Impurity 71185503-26-7C4H8ClN3O2165.58Methyl (Z)-2-(1-amino-2-chloroethylidene)hydrazine-1-carboxylate
46N-Niteoso carvidilol2248746-67-8C24H25N3O5435.5-(3-((9H-Carbazol-4-yl)oxy)-2-hydroxypropyl)-N-(2-(2-methoxyphenoxy)ethyl)nitrous amide
47N-Nitroso Duloxetine2680527-91-5C18H18N2O2S326.4N-Methyl-N-(3-(naphthalen-1-yloxy)-3-(thiophen-2-yl)propyl)nitrous amide