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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
6,7-bis(2-methoxyethoxy)-N-phenylquinazolin-4-amine 6,7-bis(2-methoxyethoxy)-N-phenylquinazolin-4-amine 1145671-52-8 C20H23N3O4
(3R,4R,5S)-ethyl 4-acetamido-5-amino-3-isopropoxycyclohex-1-enecarboxylate (3R,4R,5S)-ethyl 4-acetamido-5-amino-3-isopropoxycyclohex-1-enecarboxylate 1052063-36-1 C14H24N2O4
4-(N-(tert-butyl)acetamido)-5-(diallylamino)-3-(pentan-3-yloxy)cyclohex-1-enecarboxylate 4-(N-(tert-butyl)acetamido)-5-(diallylamino)-3-(pentan-3-yloxy)cyclohex-1-enecarboxylate 941296-96-4 C16H28N2O4
(2R,5S)-5-(4-amino-5-fluoro-2-oxopyrimidin-1(2H)-yl)-1,3-oxathiolane-2-carboxylic acid (2R,5S)-5-(4-amino-5-fluoro-2-oxopyrimidin-1(2H)-yl)-1,3-oxathiolane-2-carboxylic acid C8H8FN3O4S
Amlodipine Impurity 10 Amlodipine Impurity 10 2170104-51-3 C26H31ClN2O8S
Apixaban Impurity 15 Apixaban Impurity 15 1466571-07-2 C21H20N4O4
Clopidogrel Impurity 8 Clopidogrel Impurity 8 C15H14ClNO2S
Acyclovir Impurity I: 7,9'-[Ethylene-bis(oxymethylene)] Bis (2-amino-1-9-dihydro-6H-purin-6-one) Acyclovir Impurity I: 7,9'-[Ethylene-bis(oxymethylene)] Bis (2-amino-1-9-dihydro-6H-purin-6-one) 1797832-75-7 C14H16N10O4
Nilotinib genotoxic impurity 3 Nilotinib genotoxic impurity 3 915711-42-1 C19H17F3N4O
Dapagliflozin Open Ring Dapagliflozin Open Ring 2100872-88-4 C21H27ClO7
Rortezide impurity Rortezide impurity
Aprepitant Impurity 2 Aprepitant Impurity 2
Cabozantinib Impurity A Cabozantinib Impurity A
Loxoprofen Impurity E Loxoprofen Impurity E
(R)-4-Propylpyrrolidin-2-one (R)-4-Propylpyrrolidin-2-one 930123-37-8 C7H13NO
Rocuronium Bromide Intermediate B Impurity E-1 Rocuronium Bromide Intermediate B Impurity E-1 1190105-60-2 C29H48N2O3
4-Chloro-2-propylsulfanyl-pyrimidine 4-Chloro-2-propylsulfanyl-pyrimidine 1351990-36-7 C7H9ClN2S
benzyl (S)-2-(2-(benzofuran-6-carbonyl)-5,7-dichloro-1,2,3,4-tetrahydroisoquinoline-6-carboxamido)-3-(3-(methylsulfonyl)phenyl)propanoate benzyl (S)-2-(2-(benzofuran-6-carbonyl)-5,7-dichloro-1,2,3,4-tetrahydroisoquinoline-6-carboxamido)-3-(3-(methylsulfonyl)phenyl)propanoate 1194550-67-8 C36H30Cl2N2O7S
D-Proline, 1-[(2S)-3-mercapto-2-methyl-1-oxopropyl]- D-Proline, 1-[(2S)-3-mercapto-2-methyl-1-oxopropyl]- 119238-52-7 C9H15NO3S
2,4(1H,3H)-Pyrimidinedione,5-fluoro-1-[2-(hydroxymethyl)-1,3-oxathiolan-5-yl]-, (2S-cis)- (9CI) 2,4(1H,3H)-Pyrimidinedione,5-fluoro-1-[2-(hydroxymethyl)-1,3-oxathiolan-5-yl]-, (2S-cis)- (9CI) 145281-92-1 C8H9FN2O4S
Cyclopentanecarboxylic acid, 1-[(1-oxopentyl)amino]- Cyclopentanecarboxylic acid, 1-[(1-oxopentyl)amino]- 15026-80-9 C11H19NO3
L-Phenylalanine, N-L-leucyl-, methyl ester L-Phenylalanine, N-L-leucyl-, methyl ester 38155-18-9 C16H24N2O3
Ethanol, 2-[(2-chloroethyl)amino]- Ethanol, 2-[(2-chloroethyl)amino]- 3890-98-0 C4H10ClNO
5-Methylarabinosylcytosine 5-Methylarabinosylcytosine 6829-31-8 C10H15N3O5
Anthranilic acid, N-furfuryl-5-sulfamoyl- Anthranilic acid, N-furfuryl-5-sulfamoyl- 4818-85-3 C12H12N2O5S
1,3-Benzodioxol-4-ol 1,3-Benzodioxol-4-ol 69393-72-2 C7H6O3
1H-Benzimidazole, 6-bromo-2-methyl-4-(phenylmethoxy)- 1H-Benzimidazole, 6-bromo-2-methyl-4-(phenylmethoxy)- 774582-60-4 C15H13BrN2O
ethyl 4-dimethylamino-3-hydroxy-butanoate ethyl 4-dimethylamino-3-hydroxy-butanoate 90227-57-9 C8H17NO3
2(1H)-Pyridinone, 3,4-dihydro- 2(1H)-Pyridinone, 3,4-dihydro- 57147-25-8 C5H7NO
2-Diethylamino-N-(2,5-dimethyl-phenyl)-acetamide 2-Diethylamino-N-(2,5-dimethyl-phenyl)-acetamide 857570-37-7 C14H22N2O
(R)-1-BENZYL-3-N-BOC-AMINOPIPERIDINE (R)-1-BENZYL-3-N-BOC-AMINOPIPERIDINE 216854-24-9 C17H26N2O2
(E)-N-(2-(7-methoxy-3,4-dihydronaphthalen-1(2H)-ylidene)ethyl)acetamide (E)-N-(2-(7-methoxy-3,4-dihydronaphthalen-1(2H)-ylidene)ethyl)acetamide 178677-39-9 C15H19NO2
(Z)-methyl 3-(((4-(methylamino)phenyl)amino)(phenyl)methylene)-2-oxoindoline-6-carboxylate (Z)-methyl 3-(((4-(methylamino)phenyl)amino)(phenyl)methylene)-2-oxoindoline-6-carboxylate 1987887-92-2 C24H21N3O3
1-(prop-1-en-2-yl)-3-(2-(4-(3-(trifluoromethyl)phenyl)piperazin-1-yl)ethyl)-1H-benzo[d]imidazol-2(3H)-one 1-(prop-1-en-2-yl)-3-(2-(4-(3-(trifluoromethyl)phenyl)piperazin-1-yl)ethyl)-1H-benzo[d]imidazol-2(3H)-one 1971858-36-2 C23H25F3N4O
2-(3-(methylamino)-1-(thiophen-2-yl)propyl)naphthalen-1-ol 2-(3-(methylamino)-1-(thiophen-2-yl)propyl)naphthalen-1-ol 1033803-59-6 C18H19NOS
Bendamustine Desmethyl Impurity Bendamustine Desmethyl Impurity 41515-13-3 C15H19Cl2N3O2
(R)-N,N-dimethyl-3-(naphthalen-1-yloxy)-3-(thiophen-2-yl)propan-1-amine (R)-N,N-dimethyl-3-(naphthalen-1-yloxy)-3-(thiophen-2-yl)propan-1-amine 878757-08-5 C19H21NOS
Apixaban Impurity 17 Apixaban Impurity 17 2204368-51-2 C29H31N5O5
Aprepitant Impurity 24 Aprepitant Impurity 24
Aripiprazole Impurity 11 Aripiprazole Impurity 11
Avanafil Impurity 10 Avanafil Impurity 10
Capecitabine Impurity 10 Capecitabine Impurity 10
Carfilzomib Impurity C Carfilzomib Impurity C
Cefathiamidine Impurity 4 Cefathiamidine Impurity 4 1418224-75-5 C10H11BrN2O5S
Cefodizime Impurity 2 Cefodizime Impurity 2
Choline Fenofibrate Impurity 1 Choline Fenofibrate Impurity 1 2985-79-7 C13H9ClO2
DecitaBine Impurity 11 DecitaBine Impurity 11
Isavuconazole Impurity 21 Isavuconazole Impurity 21
Isavuconazole Impurity 27 Isavuconazole Impurity 27
Istradefylline Impurity E Istradefylline Impurity E
Linagliptin Impurity 41 Linagliptin Impurity 41
PalBociclib Impurity 17 PalBociclib Impurity 17
PalBociclib Impurity 24 PalBociclib Impurity 24
Posaconazole Impurity 12 Posaconazole Impurity 12
Perospirone Impurity 26 Perospirone Impurity 26
Paxlovid Impurity 15 Paxlovid Impurity 15
3-(2-(cyclopent-2-en-1-yl)-2-hydroxy-2-phenylacetoxy)-1,1-dimethylpyrrolidin-1-ium bromide 3-(2-(cyclopent-2-en-1-yl)-2-hydroxy-2-phenylacetoxy)-1,1-dimethylpyrrolidin-1-ium bromide
Canagliflozin Impurity 84 Canagliflozin Impurity 84
Fondaparinux sodium impurity 18 Fondaparinux sodium impurity 18
Fondaparinux sodium impurity 13 Fondaparinux sodium impurity 13
Lasmiditan Impurity 1 Lasmiditan Impurity 1
(5R,6R)-6-((R)-1-hydroxyethyl)-3-((R)-tetrahydrofuran-2-yl)-4-thia-1-azabicyclo[3.2.0]hept-2-en-7-one (5R,6R)-6-((R)-1-hydroxyethyl)-3-((R)-tetrahydrofuran-2-yl)-4-thia-1-azabicyclo[3.2.0]hept-2-en-7-one
Olodaterol Impurity 22 Olodaterol Impurity 22
Olodaterol Impurity 25 Olodaterol Impurity 25
32,43,50-Tricarboxy-cyanoco balamin 32,43,50-Tricarboxy-cyanoco balamin
(S)-Azelastine (S)-Azelastine 143228-85-7 C22H24ClN3O
Relugolix Impurity 92 Relugolix Impurity 92
N-Desethyl Vardenafil N-Desethyl Vardenafil 448184-46-1 C21H28N6O4S
O-Desmethyl Gefitinib O-Desmethyl Gefitinib 847949-49-9 C21H22ClFN4O3
Pyrazole N-Demethyl Sildenafil Pyrazole N-Demethyl Sildenafil 139755-95-6 C21H28N6O4S
S-(-)-Tolterodine S-(-)-Tolterodine 124937-53-7 C22H31NO
Posaconazole Impurity 24 Posaconazole Impurity 24 165115-78-6 C19H20F2O2
Sitagliptin Impurity 24 Sitagliptin Impurity 24 2349567-54-8 C15H19F2NO4
Tamoxifen EP Impurity H Tamoxifen EP Impurity H 809285-09-4 C43H48N2O2
Tenofovir impurity Q Tenofovir impurity Q
Trelagliptin Impurity 20 Trelagliptin Impurity 20 1821520-42-6 C20H22FN5O3
Umeclidinium Impurity 3 Umeclidinium Impurity 3 869113-45-1 C29H32BrNO3
Vardenafil Impurity 7 Vardenafil Impurity 7 448184-56-3 C21H26N6O7S
Moxifloxacin Related Compound A (HCl salt form) Moxifloxacin Related Compound A (HCl salt form) 151282-23-4 C20H22ClF2N3O3
8-Hydroxy Entecavir 8-Hydroxy Entecavir 1795791-10-4 C12H15N5O4
1-Pyrrolidinecarboxylic acid, 4-[4-(3-methyl-1-phenyl-1H-pyrazol-5-yl)-1-piperazinyl]-2-(3-thiazolidinylcarbonyl)-, 1,1-dimethylethyl ester, (2S,4R)- 1-Pyrrolidinecarboxylic acid, 4-[4-(3-methyl-1-phenyl-1H-pyrazol-5-yl)-1-piperazinyl]-2-(3-thiazolidinylcarbonyl)-, 1,1-dimethylethyl ester, (2S,4R)- 1404559-22-3 C27H38N6O3S
Ampicillin Impurity A Ampicillin Impurity A
Oxacillin Sodium Impurity B(EP) Oxacillin Sodium Impurity B(EP)
3,5-dichlorothiophene-2-carboxylic acid 3,5-dichlorothiophene-2-carboxylic acid 89166-94-9 C5H2Cl2O2S
Brexpiprazole Impurity 2 Brexpiprazole Impurity 2 2094559-58-5 C38H40N4O4S
2-methyl-6-oxo-1,6-dihydro-[3,4'-bipyridine]-5-carboxylic acid 2-methyl-6-oxo-1,6-dihydro-[3,4'-bipyridine]-5-carboxylic acid 80047-38-7 C12H10N2O3
Levofloxacin Impurity 7 Levofloxacin Impurity 7 1607796-83-7 C15H14FNO5
Moxifloxacin EP Impurity E HCl Moxifloxacin EP Impurity E HCl
Pantoprazole Impurity 11 Pantoprazole Impurity 11 172282-50-7 C7H8F2N2O
Solifenacin Related Compound 24 Solifenacin Related Compound 24 1682642-69-8 C15H23ClN2
Ticagrelor Related Compound 44 Ticagrelor Related Compound 44 1431867-40-1 C8H12ClN3OS
(trans)-2-(3,4-difluorophenyl)cyclopropanecarboxamide (trans)-2-(3,4-difluorophenyl)cyclopropanecarboxamide 1006614-51-2 C10H9F2NO
2-cyano-N-methyl-N-((3R,4R)-4-methyl piperidin-3-yl) Acetamide hydrochloride 2-cyano-N-methyl-N-((3R,4R)-4-methyl piperidin-3-yl) Acetamide hydrochloride 1640971-87-4 C10H18ClN3O
6-methyl-N1-(4-methyl-6-(pyridin-3-yl)pyrimidin-2-yl)benzene-1,3-diamine 6-methyl-N1-(4-methyl-6-(pyridin-3-yl)pyrimidin-2-yl)benzene-1,3-diamine C17H17N5
5-METHOXY-2-BENZIMIDAZOLINONE 5-METHOXY-2-BENZIMIDAZOLINONE 2080-75-3 C8H8N2O2
WPDCFRNNHUYQGW-IUXPMGMMSA-N WPDCFRNNHUYQGW-IUXPMGMMSA-N 1628639-06-4 C21H23NO4
tert-Butyl 2-((4S,6S)-6-(chloromethyl(02,2-1,3-dioxan-4-yl)acetate tert-Butyl 2-((4S,6S)-6-(chloromethyl(02,2-1,3-dioxan-4-yl)acetate 521974-00-5 C13H23ClO4
Cefadroxil Sulfoxide Cefadroxil Sulfoxide 182290-77-3 C16H17N3O6S
GSFIWDGFHNAUFU-UHFFFAOYSA-N GSFIWDGFHNAUFU-UHFFFAOYSA-N 2125702-80-7 C16H29N5O4
2,5-dichloro-N,N-dimethylbenzamide 2,5-dichloro-N,N-dimethylbenzamide 90526-01-5 C9H9Cl2NO
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