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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Febuxostat Impurity 67 Febuxostat Impurity 67
Riociguat IMpurtiy A Riociguat IMpurtiy A
Peramivir Impurity C Peramivir Impurity C
Lincomycin sulfoxide Impurity 6 Lincomycin sulfoxide Impurity 6
Metronidazole IMpurity 5 Metronidazole IMpurity 5
Sulpiride Impurity 5 Sulpiride Impurity 5
methyl 3-(4-(3-(ethylamino)-2-hydroxypropoxy)phenyl)propanoate hydrochloride methyl 3-(4-(3-(ethylamino)-2-hydroxypropoxy)phenyl)propanoate hydrochloride C15H24ClNO4
Tacrolimus Impurity F Tacrolimus Impurity F
Cefminox Impurity E Cefminox Impurity E
Oxaliplatin impurity Oxaliplatin impurity
NiMesulide EP IMpurity NiMesulide EP IMpurity 38880-53-4 C7H8N2O5S
Alogliptin Impurity D Alogliptin Impurity D 1926163-25-8 C61H86N16O13
Moxifloxacin Impurities Moxifloxacin Impurities
Parecoxib Impurity K Parecoxib Impurity K 198471-69-1 C17H16N2O3S
Linagliptin Impurity K Linagliptin Impurity K 1638744-06-5 C25H29BrN8O2
(R)-2-((6-(3-((3-(2-cyano-5-fluorobenzyl)-1-methyl-2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-yl)amino)piperidin-1-yl)-3-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)methyl)-4-fluorobenzonitrile (R)-2-((6-(3-((3-(2-cyano-5-fluorobenzyl)-1-methyl-2,6-dioxo-1,2,3,6-tetrahydropyrimidin-4-yl)amino)piperidin-1-yl)-3-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)methyl)-4-fluorobenzonitrile 1917324-13-0 C31H28F2N8O4
L-Phenylalanine, N-[(5,7-dichloro-1,2,3,4-tetrahydro-6-isoquinolinyl)carbonyl]-3-(methylsulfonyl)-, phenylmethyl ester, hydrochloride (1:1) L-Phenylalanine, N-[(5,7-dichloro-1,2,3,4-tetrahydro-6-isoquinolinyl)carbonyl]-3-(methylsulfonyl)-, phenylmethyl ester, hydrochloride (1:1) 1194550-65-6 C27H27Cl3N2O5S
Alogliptin Related Compound 23 Alogliptin Related Compound 23 1618644-29-3 C20H13ClN4O2
Etoricoxib Impurity 14 Etoricoxib Impurity 14
Riociguat Impurtiy 3 Riociguat Impurtiy 3
Trelagliptin Impurity 2 Trelagliptin Impurity 2
Chlorhexidine Impurity B Chlorhexidine Impurity B 1308292-89-8 C16H26ClN9O
Dapoxetine Impurity D Dapoxetine Impurity D
Eltrombopag Impurity 5 Eltrombopag Impurity 5
Exemestane Impurity 1 Exemestane Impurity 1 159354-61-7 C20H24O3
Lidocaine Impurity Lidocaine Impurity 35891-84-0 C11H17ClN2O
Pramipexole Impurity J Pramipexole Impurity J
Solifenacin Related Compound 14 Solifenacin Related Compound 14 605696-10-4 C25H30N2O2
4-amino-1-((2R,3R,5S)-2-(hydroxymethyl)-3-oxido-1,3-oxathiolan-5-yl)pyrimidin-2(1H)-one 4-amino-1-((2R,3R,5S)-2-(hydroxymethyl)-3-oxido-1,3-oxathiolan-5-yl)pyrimidin-2(1H)-one 160552-54-5 C8H11N3O4S
1-(4-Hydroxyphenyl)-7-oxo-6-[4-(2-oxopiperidin-1-yl)phenyl]-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxamide 1-(4-Hydroxyphenyl)-7-oxo-6-[4-(2-oxopiperidin-1-yl)phenyl]-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxamide 503612-76-8 C24H23N5O4
8-[(1R)-1-Hydroxy-2-[[2-(4-methoxyphenyl)-1,1-dimethylethyl]amino]ethyl]-6-(phenylmethoxy)-2H-1,4-benzoxazin-3(4H)-one 8-[(1R)-1-Hydroxy-2-[[2-(4-methoxyphenyl)-1,1-dimethylethyl]amino]ethyl]-6-(phenylmethoxy)-2H-1,4-benzoxazin-3(4H)-one 869478-13-7 C28H32N2O5
1-(2-(methylamino)ethyl)piperidin-4-yl [1,1'-biphenyl]-2-ylcarbamate 1-(2-(methylamino)ethyl)piperidin-4-yl [1,1'-biphenyl]-2-ylcarbamate 743460-48-2 C21H27N3O2
Cefuroxime Sodium impurity D Cefuroxime Sodium impurity D C16H16N4NaO8S
Silodosin impurity A Silodosin impurity A
cefditoren △-3 isomer cefditoren △-3 isomer
Ixazomib Impurity 1 Ixazomib Impurity 1 1201903-02-7 C24H33BCl2N2O4
Ofloxacin/Levofloxacin Impurity E Ofloxacin/Levofloxacin Impurity E
(3S)-9,10-difluoro-3-methyl-7-oxo-2,3,6,7-tetrahydro-5H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic acid (3S)-9,10-difluoro-3-methyl-7-oxo-2,3,6,7-tetrahydro-5H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic acid 1026952-91-9 C13H11F2NO4
((4-Methoxyphenoxy)methylene)dibenzene ((4-Methoxyphenoxy)methylene)dibenzene 85686-16-4 C20H18O2
Tofacitinib Impurity L Tofacitinib Impurity L
1-chloro-3-(dimethoxymethyl)benzene 1-chloro-3-(dimethoxymethyl)benzene 3395-80-0 C9H11ClO2
N-(3-bromo-4-oxocyclohexyl)acetamide N-(3-bromo-4-oxocyclohexyl)acetamide 687639-03-8 C8H12BrNO2
methyl (Z)-3-(hydroxy(phenyl)methylene)-2-oxoindoline-6-carboxylate methyl (Z)-3-(hydroxy(phenyl)methylene)-2-oxoindoline-6-carboxylate C44H51N9O4
Alvimopan Impurity 5 Alvimopan Impurity 5
Palbociclib-d8 Palbociclib-d8 1628752-83-9 C24H21D8N7O2
Ivabradine Impurity 15 Ivabradine Impurity 15 1132667-04-9 C12H17NO2
Sofosbuvir Impurity27 Sofosbuvir Impurity27
Isavuconazole Impurity 12 Isavuconazole Impurity 12
Tacrolimus Impurity 3 Tacrolimus Impurity 3 161861-10-5 C45H71NO13
Aprepitant EP Impurity C Aprepitant EP Impurity C 2208275-99-2 C29H25F7N4O3
Bisoprolol EP Impurity J Bisoprolol EP Impurity J 1797024-50-0 C15H24O5
Ceftriaxone Impurity Ceftriaxone Impurity 79221-95-7 C18H18N8O8S3
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
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