Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Betaxolol EP Impurity E Betaxolol EP Impurity E 1329613-85-5 C18H31NO3
Tulobuterol Impurity Tulobuterol Impurity 34356-83-7 C8H5Br2ClO
Olaparib Impurity A Olaparib Impurity A
Dapoxetine Impurity 2 Dapoxetine Impurity 2
Voriconazole Impurity 5 Voriconazole Impurity 5
tetrahydrofuran-3-yl 2-cyclopentyl-2-hydroxy-2-phenylacetate tetrahydrofuran-3-yl 2-cyclopentyl-2-hydroxy-2-phenylacetate 1404453-75-3 C17H22O4
Lamivudine impurity 5 Lamivudine impurity 5
Clopidogrel Impurity 2 Clopidogrel Impurity 2 C15H14ClNO2S
Mirabegron Impurity 6 Mirabegron Impurity 6 2762802-64-0 C10H11ClN4O3S2
Pitavastatin Impurity 3 Pitavastatin Impurity 3
Solifenacin EP Impurity D Solifenacin EP Impurity D
Cephalexin Impurity 2 Cephalexin Impurity 2 C16H17N3O4S
Cefuroxime Impurity 3 Cefuroxime Impurity 3 C16H16N4O8S
Vonoprazan Impurity 11 Vonoprazan Impurity 11
Atracurium Impurity A Atracurium Impurity A
Erlotinib Imp.14 Erlotinib Imp.14
Sorafenib related compound 12 Sorafenib related compound 12 284461-74-1 C20H14ClF3N4O3
Apremilast Impurity 10 Apremilast Impurity 10 1809170-71-5 C22H26N2O8S
(1R,3S)-Solifenacin Succinate (1R,3S)-Solifenacin Succinate 774517-20-3 C23H26N2O2
Dacpomycin Impurity 2 Dacpomycin Impurity 2
Nicorandil Impurity 3 Nicorandil Impurity 3
Tacrolimus Impurity A Tacrolimus Impurity A
1H-Benz[de]isoquinolin-1-one,2-(3S)-1-azabicyclo[2.2.2]oct-3-yl-2,3,3a,4,5,6-hexahydro-,(3aR)- 1H-Benz[de]isoquinolin-1-one,2-(3S)-1-azabicyclo[2.2.2]oct-3-yl-2,3,3a,4,5,6-hexahydro-,(3aR)- 135729-73-6 C19H24N2O
Afatinib Impurity 16 Afatinib Impurity 16
Mirabegron Impurity 19 Mirabegron Impurity 19
(Z)-Mutagenic Impurity of Tenofovir Disoproxil (Z)-Mutagenic Impurity of Tenofovir Disoproxil 1464851-21-5 C8H9N5
Moxifloxacin impurity (20) Moxifloxacin impurity (20)
(R)-2-(2-(tert-butoxy)-2-oxoethyl)pentanoic acid (R)-2-(2-(tert-butoxy)-2-oxoethyl)pentanoic acid 112106-16-8 C11H20O4
Bazedoxifene impurity Bazedoxifene impurity
Tamsulosin impurity Tamsulosin impurity C20H28N2O5S
Clarithromycin (9Z)-Oxime Clarithromycin (9Z)-Oxime 127253-05-8 C38H70N2O13
N-Desmethyl Clarithromycin (9E)-Oxime N-Desmethyl Clarithromycin (9E)-Oxime 127182-43-8 C37H68N2O13
Ticagrelor Impurity 24 Ticagrelor Impurity 24 1482484-92-3 C7H11N3O2S
Moxifloxacin Impurity Moxifloxacin Impurity 1797982-51-4 C16H16FNO5
sofosBuvir impurity 1 sofosBuvir impurity 1
2-(3-cyano-4-isopropoxyphenyl)-4-methylthiazole-5-carboxylic acid 2-(3-cyano-4-isopropoxyphenyl)-4-methylthiazole-5-carboxylic acid 144060-52-6 C15H14N2O3S
Alogliptin Related Compound 26 Alogliptin Related Compound 26 865759-10-0 C25H24N6O2
R-Tirofiban R-Tirofiban 158808-86-7 C22H36N2O5S
Canagliflozin Impurity 20 Canagliflozin Impurity 20
Canagliflozin Impurity 6 Canagliflozin Impurity 6
Carfilzomib Impurity 6 Carfilzomib Impurity 6
Daclatasvir Impurity 5 (SRSS-Isomer) Daclatasvir Impurity 5 (SRSS-Isomer) 1009117-28-5 C40H50N8O6
Dolutegravir Impurity 7 Dolutegravir Impurity 7 2244161-71-3 C20H21N3O5
Istradefylline Impurity F Istradefylline Impurity F
Linagliptin Impurity 22 Linagliptin Impurity 22
Nintedanib impurity G Nintedanib impurity G 894783-61-0 C30H31N5O4
3,3′-[(2-methylbenzene-1,3-diyl)bis(oxy)]bis(N-methyl- 3-phenylpropan-1-amine) 3,3′-[(2-methylbenzene-1,3-diyl)bis(oxy)]bis(N-methyl- 3-phenylpropan-1-amine) 1010818-93-5 C27H34N2O2
Febuxostat impurity 36 Febuxostat impurity 36 1805770-40-4 C12H12N2O
N-[1-[(3R)-1-(1-oxo-2-propen-1-yl)-3-piperidinyl]-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-yl]- 2-Propenamide N-[1-[(3R)-1-(1-oxo-2-propen-1-yl)-3-piperidinyl]-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-yl]- 2-Propenamide 2031255-27-1 C28H26N6O3
4-amino-5-fluoro-1-((2R,5S)-2-(hydroxymethyl)-3-oxido-1,3-oxathiolan-5-yl)pyrimidin-2(1H)-one 4-amino-5-fluoro-1-((2R,5S)-2-(hydroxymethyl)-3-oxido-1,3-oxathiolan-5-yl)pyrimidin-2(1H)-one C8H11FN3O4S-
Anastrozole Impurity 3 Anastrozole Impurity 3
Cephalexin Impurity 4 Cephalexin Impurity 4 C16H17N3O4S
Rivaroxaban Impurity 42 Rivaroxaban Impurity 42
(R,E)-7-(4-(4-fluorophenyl)-6-isopropyl-2-(N-methylmethylsulfonamido)pyrimidin-5-yl)-3-hydroxy-5-oxohept-6-enoic acid (R,E)-7-(4-(4-fluorophenyl)-6-isopropyl-2-(N-methylmethylsulfonamido)pyrimidin-5-yl)-3-hydroxy-5-oxohept-6-enoic acid 1422514-05-3 C22H26FN3O6S
4,5-Dibromo-1,2-benzenediol 4,5-Dibromo-1,2-benzenediol 2563-26-0 C6H4Br2O2
2-[4-(3-CHLORO-2-HYDROXYPROPOXY)PHENYL]ACETAMIDE 2-[4-(3-CHLORO-2-HYDROXYPROPOXY)PHENYL]ACETAMIDE 115538-83-5 C11H14ClNO3
Ibuprofen Alcohol Ibuprofen Alcohol 36039-36-8 C13H20O
Sugammadex sodium Impurity 52 Sugammadex sodium Impurity 52
Sugammadex sodium Impurity 43 Sugammadex sodium Impurity 43
Sugammadex sodium Impurity 39 Sugammadex sodium Impurity 39
Apixaban Impurity 52 Apixaban Impurity 52 1620494-31-6 C31H29N5O4
Cefazolin Impurity EP-J Cefazolin Impurity EP-J
Cabozantinib impurity 41 Cabozantinib impurity 41
Cabozantinib impurity 67 Cabozantinib impurity 67
ethyl 6-bromo-2-(bromomethyl)-5-hydroxy-1-methyl-1H-indole-3-carboxylate ethyl 6-bromo-2-(bromomethyl)-5-hydroxy-1-methyl-1H-indole-3-carboxylate 149246-36-6 C13H13Br2NO3
Dapoxetine impurity 50 Dapoxetine impurity 50
Doxofylline Impurity 18 Doxofylline Impurity 18
Dapoxetine impurity 63 Dapoxetine impurity 63
Dapoxetine impurity 57 Dapoxetine impurity 57
Bosutinib Impurity 2 (N-Desmethyl Bosutinib) Bosutinib Impurity 2 (N-Desmethyl Bosutinib) 380843-81-2 C25H27Cl2N5O3
Benzamide, 2,5-dichloro-N-(3-methylbutyl)- Benzamide, 2,5-dichloro-N-(3-methylbutyl)- 349086-08-4 C12H15Cl2NO
BECLOTIAMINE BECLOTIAMINE 13471-78-8 C12H16Cl2N4S
methyl 5-sulpho-o-anisate methyl 5-sulpho-o-anisate 94134-07-3 C9H10O6S
2,4-dioxo-3-azaspiro[5.5]undecane-1,5-dicarbonitrile 2,4-dioxo-3-azaspiro[5.5]undecane-1,5-dicarbonitrile 4355-15-1 C12H13N3O2
INDEX NAME NOT YET ASSIGNED INDEX NAME NOT YET ASSIGNED 2412953-11-6 C72H112O49S8
Sulfamide, N-[5-phenyl-6-[2-(2-pyrimidinyloxy)ethoxy]-4-pyrimidinyl]-N'-propyl- Sulfamide, N-[5-phenyl-6-[2-(2-pyrimidinyloxy)ethoxy]-4-pyrimidinyl]-N'-propyl- 2300968-85-6 C19H22N6O4S
Acetamide, 2-chloro-N-(2-chloroacetyl)-N-(2,6-dimethylphenyl)- Acetamide, 2-chloro-N-(2-chloroacetyl)-N-(2,6-dimethylphenyl)- 112843-97-7 C12H13Cl2NO2
1-[2-cyano-1-(cyanoimino)ethyl]piperidine 1-[2-cyano-1-(cyanoimino)ethyl]piperidine 56488-00-7 C9H12N4
Oseltamivir Impurity 99 Oseltamivir Impurity 99
Oseltamivir  Impurity 92 Oseltamivir Impurity 92
Oseltamivir  Impurity 76 Oseltamivir Impurity 76
Regorafenib Impurity ABCDEFGHJKL Regorafenib Impurity ABCDEFGHJKL
(S)-2-((1r,3R,5R,7S)-3-hydroxyadamantan-1-yl)-1-iminohexahydro pyrrolo[1,2-a]pyrazin-4(1H)-one hydrochloride (S)-2-((1r,3R,5R,7S)-3-hydroxyadamantan-1-yl)-1-iminohexahydro pyrrolo[1,2-a]pyrazin-4(1H)-one hydrochloride
Atorvastatin 2-Fluoro t-Butyl Ester Atorvastatin 2-Fluoro t-Butyl Ester 1099474-28-8 C40H47FN2O5
Cabozantinib Impurity C Cabozantinib Impurity C
(3R,4R)-N,4-dimethyl-piperidin-3-amine (3R,4R)-N,4-dimethyl-piperidin-3-amine 1354469-76-3 C7H16N2
4-(1H-Pyrazol-4-yl)-7H-pyrrolo[2,3-d]pyrimidine 4-(1H-Pyrazol-4-yl)-7H-pyrrolo[2,3-d]pyrimidine 952518-97-7 C9H7N5
5-phenyl-1-(pyridin-3-ylsulfonyl)-1H-pyrrole-3-carbaldehyde 5-phenyl-1-(pyridin-3-ylsulfonyl)-1H-pyrrole-3-carbaldehyde 881676-90-0 C16H12N2O3S
3-Piperidinemethanol, 4-(4-fluorophenyl)-1-methyl-, (3R,4R)- 3-Piperidinemethanol, 4-(4-fluorophenyl)-1-methyl-, (3R,4R)- 100332-12-5 C13H18FNO
r-Cytidine r-Cytidine 13913-16-1 C9H13N3O5
Pyridine, 4-chloro-2-(chloromethyl)-3-methyl- Pyridine, 4-chloro-2-(chloromethyl)-3-methyl- 168167-48-4 C7H7Cl2N
1,2,4-Triazolo(3,4-b)benzothiazole-5-methanol 1,2,4-Triazolo(3,4-b)benzothiazole-5-methanol 69243-49-8 C9H7N3OS
Benzoicacid, 2-sulfino- Benzoicacid, 2-sulfino- 13165-80-5 C7H6O4S
Benzenemethanamine, a-ethyl-N,N-dimethyl- Benzenemethanamine, a-ethyl-N,N-dimethyl- 3330-05-0 C11H17N
CIS-1,2-BIS(AMINOMETHYL)CYCLOBUTANE CIS-1,2-BIS(AMINOMETHYL)CYCLOBUTANE 15286-88-1 C6H14N2
N-FORMYL-1-(2-AMINO-1-(4-METHOXYPHENYL)ETHYL)CYCLOHEXANOL N-FORMYL-1-(2-AMINO-1-(4-METHOXYPHENYL)ETHYL)CYCLOHEXANOL 272788-07-5 C16H23NO3
Acotiamide  Impurity Acotiamide Impurity 198470-83-6 C20H21N2NaO4S
Terbutaline  Impurity Terbutaline Impurity 52144-90-8 C26H29NO3
methyl (41S,12R,13aR)-13a-ethyl-12-
hydroxy-2,3,41,5,6,12,13,13aoctahydro-
1H-indolo[3,2,1-
de]pyrido[3,2,1-ij][1,5]naphthyridine-
12-carboxylate methyl (41S,12R,13aR)-13a-ethyl-12- hydroxy-2,3,41,5,6,12,13,13aoctahydro- 1H-indolo[3,2,1- de]pyrido[3,2,1-ij][1,5]naphthyridine- 12-carboxylate 83508-83-2 C21H26N2O3
ethyl 4-(5-methyl-3-phenylisoxazol-4-yl)benzenesulfonate ethyl 4-(5-methyl-3-phenylisoxazol-4-yl)benzenesulfonate 473465-11-1 C18H18N2O3S
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