Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
8-(benzo[b]thiophen-4-yl)-5,8-diazaspiro[4.5]decan-5-ium chloride 8-(benzo[b]thiophen-4-yl)-5,8-diazaspiro[4.5]decan-5-ium chloride 2143944-64-1 C16H21N2S+
2-(4'-chloro-2,3,4,5-tetrahydro-[1,1'-biphenyl]-4-yl)-3-hydroxynaphthalene-1,4-dione 2-(4'-chloro-2,3,4,5-tetrahydro-[1,1'-biphenyl]-4-yl)-3-hydroxynaphthalene-1,4-dione 1809464-27-4 C22H17ClO3
Aprepitant impurity C Aprepitant impurity C
Ticagrelor Related Compound 14 Ticagrelor Related Compound 14 2056269-94-2 C23H28F2N6O4S
Cefoxitin impurity E Cefoxitin impurity E 2395025-32-6 C17H19N3O8S2
N-((4-(3-methyl-5-phenylisoxazol-4-yl)phenyl)sulfonyl)propionamide N-((4-(3-methyl-5-phenylisoxazol-4-yl)phenyl)sulfonyl)propionamide 477594-28-8 C19H18N2O4S
Moxifloxacin EP Impurity D HCl Moxifloxacin EP Impurity D HCl
Moxifloxacin Impurity 30 Moxifloxacin Impurity 30 1395056-42-4 C21H24FN3O7
Tenofovir Impurity 37 Tenofovir Impurity 37 161760-03-8 C10H15O6PS
Apremilast Apremilast 1384967-20-7 C20H20N2O7S
Pramipexole Impurity 30 Pramipexole Impurity 30 1802051-36-0 C13H24ClN3S
NZWJKTHFNLHUJO-NWZSJJIMSA-N NZWJKTHFNLHUJO-NWZSJJIMSA-N 1422954-12-8 C22H26FN3O5S
LAT-NET LAT-NET 607351-44-0 C25H39NO4
N,N-(ethane-1,2-diyl)bis(4-methyl-N-(3-((4-methylphenyl)sulfonamido)propyl)benzenesulfonamide) N,N-(ethane-1,2-diyl)bis(4-methyl-N-(3-((4-methylphenyl)sulfonamido)propyl)benzenesulfonamide) 74676-47-4 C36H46N4O8S4
L-GLUCONO-1,5-LACTONE L-GLUCONO-1,5-LACTONE 52153-09-0 C6H10O6
C-Desmethyl Atenolol C-Desmethyl Atenolol 1797116-92-7 C13H20N2O3
Fenofibric Acid 1-Carboxyl-1-methylethyl Ester Fenofibric Acid 1-Carboxyl-1-methylethyl Ester 1797121-54-0 C21H21ClO6
2-Chloro-4'-fluorobenzophenone 2-Chloro-4'-fluorobenzophenone 1806-23-1 C13H8ClFO
Diltiazem impurity Diltiazem impurity 115992-91-1 C17H18N2O3S
Raloxifene EP IMpurity Raloxifene EP IMpurity 1700655-64-6 C13H15ClN2O2S
Parecoxib Impurity M Parecoxib Impurity M
Cycloocta[b]pyridine, 2-(4-ethyl-1-piperazinyl)-4-[4-(4-ethyl-1-piperazinyl)phenyl]-5,6,7,8,9,10-hexahydro- Cycloocta[b]pyridine, 2-(4-ethyl-1-piperazinyl)-4-[4-(4-ethyl-1-piperazinyl)phenyl]-5,6,7,8,9,10-hexahydro- 1648791-23-4 C29H43N5
Linagliptin Impurity O Linagliptin Impurity O
Linagliptin Impurity T Linagliptin Impurity T
(R)-2-((6-(3-aminopiperidin-1-yl)-3-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)methyl)-4-fluorobenzamide (R)-2-((6-(3-aminopiperidin-1-yl)-3-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)methyl)-4-fluorobenzamide C18H22FN5O3
Apremilast Impurity 2 Apremilast Impurity 2
Etoricoxib Impurity 16 Etoricoxib Impurity 16
Ibrutinib Impurity 2 Ibrutinib Impurity 2
Mirabegron Impurity 14 Mirabegron Impurity 14
Vonoprazan Impurity 1 Vonoprazan Impurity 1 881732-90-7 C17H17N3O2S
Atenolol EP Impurity Atenolol EP Impurity C14H22N2O3
Cinacalcet Impurity 20 Cinacalcet Impurity 20
Dapagliflozin Impurity 11 Dapagliflozin Impurity 11
Dasatinib Impurity C Dasatinib Impurity C
Etoricoxib impurity Q Etoricoxib impurity Q 292067-97-1 C18H15ClN2S
Flucloxacillin Impurity Flucloxacillin Impurity
Fluorometholone Impurity Fluorometholone Impurity 2796-99-8 C23H31FO7S
Verapamil Impurity Verapamil Impurity 1551304-28-9 C12H19NO2
Clopidogrel impurity reference substance Clopidogrel impurity reference substance C15H14ClNO2S
Vildagliptin Impurity Vildagliptin Impurity
Aloeemodin-ω-O-β-D-glucopyranoside Aloeemodin-ω-O-β-D-glucopyranoside 29010-56-8 C21H20O10
ethyl 1-(4-chlorophenyl)-7-oxo-6-(4-(2-oxopiperidin-1-yl)phenyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxylate ethyl 1-(4-chlorophenyl)-7-oxo-6-(4-(2-oxopiperidin-1-yl)phenyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxylate 2029205-62-5 C26H25ClN4O4
1-Butanaminium, N,N,N-tributyl-, (1R,2S,5R)-2-(aminocarbonyl)-7-oxo-1,6-diazabicyclo[3.2.1]oct-6-yl sulfate 1-Butanaminium, N,N,N-tributyl-, (1R,2S,5R)-2-(aminocarbonyl)-7-oxo-1,6-diazabicyclo[3.2.1]oct-6-yl sulfate 1192651-80-1 C23H46N4O6S
Dihydroxyoxaliplatin(Oxaliplatin Impurity Ⅲ) Dihydroxyoxaliplatin(Oxaliplatin Impurity Ⅲ)
cefditoren E-isomer(C=C) cefditoren E-isomer(C=C)
Mixture of Lamivudine Impurity Ⅳ and Impurity Ⅴ Mixture of Lamivudine Impurity Ⅳ and Impurity Ⅴ
2-Ethoxybenzimidohydrazide 2-Ethoxybenzimidohydrazide 889943-46-8 C9H13N3O
(E)-2-(6-(methoxycarbonyl)-2-oxoindolin-3-ylidene)-2-phenylacetic acid (E)-2-(6-(methoxycarbonyl)-2-oxoindolin-3-ylidene)-2-phenylacetic acid C18H13NO5
8-Epi-cyanocobalamin 8-Epi-cyanocobalamin 41325-63-7 C63H88CoN14O14P
Lamivudine Impurity 2 Lamivudine Impurity 2 200396-21-0 C18H27N3O4S
Lamivudine Impurity 1 Lamivudine Impurity 1 1235712-40-9 C8H11N3O4S
Moxifloxacin Related Impurity 3 Moxifloxacin Related Impurity 3
Bisoprolol EP Impurity Q Bisoprolol EP Impurity Q 1346604-00-9 C16H27NO4
Ambrisentan Impurity E Ambrisentan Impurity E 1312092-82-2 C21H18N2O3
Levofloxacin N-Oxide Levofloxacin N-Oxide 117678-37-2 C18H20FN3O5
Oseltamivir EP Impurity A Oseltamivir EP Impurity A 1391047-93-0 C14H24N2O4
Quetiapine EP Impurity N Quetiapine EP Impurity N 1800291-86-4 C29H41N5O3S
Ceftazidime Impurity Ceftazidime Impurity
Chlorhexidine Digluconate Impurity N Chlorhexidine Digluconate Impurity N 152504-10-4 C15H25ClN8
S-Azetidin-3-yl ethanethioate HCl S-Azetidin-3-yl ethanethioate HCl 886615-18-5 C5H9NOS
Olaparib Impurity C Olaparib Impurity C
Olaparib Impurity F Olaparib Impurity F
Dapoxetine Impurity 4 Dapoxetine Impurity 4
Glycopyrrolate impurity 3 Glycopyrrolate impurity 3
Lamotrigine impurity B Lamotrigine impurity B
Ramosetron Impurity 3 Ramosetron Impurity 3
Loratadine Impurity 1 Loratadine Impurity 1 C22H23ClN2O2
Metoprolol IMpurity 6 Metoprolol IMpurity 6 C15H25NO3
Pitavastatin Impurity 5 Pitavastatin Impurity 5
Prasugrel Impurity C Prasugrel Impurity C
Trifluridine Impurity 2 Trifluridine Impurity 2
Cefazolin Impurity 4 Cefazolin Impurity 4
Vonoprazan Impurity 3 Vonoprazan Impurity 3
Cinacalcene Impurity I Cinacalcene Impurity I
Valsartan Impurity 2 Valsartan Impurity 2 C24H29N5O3
Istradefylline Impurity 2 Istradefylline Impurity 2
Etoricoxib Impurity 3 Etoricoxib Impurity 3
Apremilast Impurity 5 Apremilast Impurity 5 200710-04-9 C11H13NO4
Topiroxostat Imp.C Topiroxostat Imp.C
(3R,4S)-1-(4-chlorophenyl)-3-((S)-3-(4-fluorophenyl)-3-hydroxypropyl)-4-(4-hydroxyphenyl)azetidin-2-one (3R,4S)-1-(4-chlorophenyl)-3-((S)-3-(4-fluorophenyl)-3-hydroxypropyl)-4-(4-hydroxyphenyl)azetidin-2-one 1700622-08-7 C24H21ClFNO3
Rabeprazole Impurity 2 Rabeprazole Impurity 2 1163685-31-1 C11H15NO4
Regorafenib Impurity 8 Regorafenib Impurity 8
Flomoxef Impurity 5 Flomoxef Impurity 5 134237-56-2 C25H23ClF2N2O6S
Ranitidine  impurity Ranitidine impurity 94167-82-5 C10H18N2O
nicergoline impurity E nicergoline impurity E
ethyl(2R,4S)-5-([1,1'-biphenyl]-4-yl)-4-(4-ethoxy-4-oxobutanamido)-2-methylpentanoate ethyl(2R,4S)-5-([1,1'-biphenyl]-4-yl)-4-(4-ethoxy-4-oxobutanamido)-2-methylpentanoate C26H33NO5
Tacrolimus Impurity C Tacrolimus Impurity C
Levodopa impurity 5 Levodopa impurity 5
(R)-N-(5-((R)-2-(2,5-difluorophenyl)pyrrolidin-1-yl)pyrazolo[1,5-a]pyrimidin-3-yl)-3-hydroxypyrrolidine-1-carboxamide (R)-N-(5-((R)-2-(2,5-difluorophenyl)pyrrolidin-1-yl)pyrazolo[1,5-a]pyrimidin-3-yl)-3-hydroxypyrrolidine-1-carboxamide 1223404-68-9 C21H22F2N6O2
Afatinib Impurity 18 Afatinib Impurity 18 2316847-95-5 C22H20ClFN4O4
Ivabradine Impurity 1 Hydrochloride Ivabradine Impurity 1 Hydrochloride 85175-52-6 C16H25ClN2O3
SofosBuvir Impurity 3 SofosBuvir Impurity 3
phenyl (4-((6-carbamoyl-7-methoxyquinolin-4-yl)oxy)-2-chlorophenyl)carbamate phenyl (4-((6-carbamoyl-7-methoxyquinolin-4-yl)oxy)-2-chlorophenyl)carbamate 417722-95-3 C24H18ClN3O5
Canagliflozin Impurity 10 Canagliflozin Impurity 10 1672658-93-3 C24H25FO6S
Canagliflozin Impurity F Canagliflozin Impurity F
Empagliflozin impurity E Empagliflozin impurity E
Fasudil Impurity 6 Fasudil Impurity 6 2044706-58-1 C11H11NO3S
Ibrutinib Impurity 11 Ibrutinib Impurity 11
Nintedanib impurity I Nintedanib impurity I 334951-61-0 C30H31N5O4
(Z)-3-(hydroxy(phenyl)methylene)-2-oxoindoline-6-carboxylic acid compound with 3-benzoyl-2-oxoindoline-6-carboxylic acid (Z)-3-(hydroxy(phenyl)methylene)-2-oxoindoline-6-carboxylic acid compound with 3-benzoyl-2-oxoindoline-6-carboxylic acid 1253768-91-0 C16H11NO4
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