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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Cefathiamidine Impurity 5 Cefathiamidine Impurity 5 40818-86-8 C10H11ClN2O4S
methyl 4-hydroxy-3,5-diisopropylbenzoic acid methyl 4-hydroxy-3,5-diisopropylbenzoic acid C14H20O3
Apixaban Impurity J Apixaban Impurity J
Avibactam Impurity C Avibactam Impurity C
Brexpiprazole Impurity M Brexpiprazole Impurity M
Cefaclor Impurity 5 Cefaclor Impurity 5
Linagliptin Impurity 39 Linagliptin Impurity 39
Peramivir Impurity 5 Peramivir Impurity 5
Pidotimod Impurity O Pidotimod Impurity O
Pramipexole EP Impurity C Pramipexole EP Impurity C
Imiquimod Impurity 5 Imiquimod Impurity 5 853793-02-9 C15H18N4
9-(1,3-diacetate-2-propoxymethyl)guanine 9-(1,3-diacetate-2-propoxymethyl)guanine 86357-19-9 C13H17N5O6
Cefadroxil Impurity 6 Cefadroxil Impurity 6 2378158-45-1 C32H32N6O9S2
Loratadine Impurity 9 Loratadine Impurity 9 125743-81-9 C22H23ClN2O2
Metronidazole Impurity 1 Metronidazole Impurity 1
Parecoxib Impurity 16 Parecoxib Impurity 16 2235371-89-6 C19H18N2O4S
Rosuvastatin Impurity 54 Rosuvastatin Impurity 54
Vonoprazan Fumarate Impurity 6 Vonoprazan Fumarate Impurity 6 2250243-23-1 C33H27F2N5O4S2
3-((3aS,4R,6S,6aR)-6-(2-hydroxyethoxy)-2,2-dimethyltetrahydro- 4H-cyclopenta[d][1,3]dioxol-4-yl)-5-(propylthio)-3H-[1,2,3] triazolo[4,5-d]pyrimidin-7-ol 3-((3aS,4R,6S,6aR)-6-(2-hydroxyethoxy)-2,2-dimethyltetrahydro- 4H-cyclopenta[d][1,3]dioxol-4-yl)-5-(propylthio)-3H-[1,2,3] triazolo[4,5-d]pyrimidin-7-ol 1456538-51-4 C17H25N5O5S
Esomeprazole Impurity 24 Esomeprazole Impurity 24
Prasugrel Impurity 15 Prasugrel Impurity 15
Pregabalin Impurity 18 Pregabalin Impurity 18 1621171-19-4 C9H15NO2
Pregabalin Impurity 23 Pregabalin Impurity 23
Butylphthalide impurity Butylphthalide impurity 16692-58-3 C12H14O2
ethyl 2,5-dihydroxybenzenesulfonate ethyl 2,5-dihydroxybenzenesulfonate C8H10O5S
5-ALLYLIDENE-10,11-DIHYDRO-5H-DIBENZO[A,D]CYCLOHEPTENE 5-ALLYLIDENE-10,11-DIHYDRO-5H-DIBENZO[A,D]CYCLOHEPTENE 24755-73-5 C18H16
Nintedanib Impurity 27 Nintedanib Impurity 27
ethyl 2-(2-formyl-3-hydroxyphenyl)-4-methylthiazole-5- carboxylate ethyl 2-(2-formyl-3-hydroxyphenyl)-4-methylthiazole-5- carboxylate C14H13NO4S
LUMAT-004 LUMAT-004 313544-31-9 C16H17N3O3
Varenicline Impurity 3 Varenicline Impurity 3 1333145-89-3 C14H15N3
Econazole Related Compound C (15 mg) (1-(4-Chlorobenzyl)-3-[(2RS)-2-[(4-chlorobenzyl)oxy]-2-(2,4-dichlorophenyl)ethyl]imidazolium chloride) Econazole Related Compound C (15 mg) (1-(4-Chlorobenzyl)-3-[(2RS)-2-[(4-chlorobenzyl)oxy]-2-(2,4-dichlorophenyl)ethyl]imidazolium chloride)
Amlodipine Impurity 22 (Z-Isomer) Amlodipine Impurity 22 (Z-Isomer) C26H31ClN2O8S
Amlodipine Impurity 28 Amlodipine Impurity 28 79781-21-8 C18H20ClNO5
Axitinib Impurity 16 Axitinib Impurity 16
Axitinib Impurity 22 Axitinib Impurity 22
Imidazo[5,1-f][1,2,4]triazin-4(1H)-one, 2-[2-ethoxy-5-[(4-ethyl-4-oxido-1-piperazinyl)sulfonyl]phenyl]-5-methyl-7-propyl- Imidazo[5,1-f][1,2,4]triazin-4(1H)-one, 2-[2-ethoxy-5-[(4-ethyl-4-oxido-1-piperazinyl)sulfonyl]phenyl]-5-methyl-7-propyl- 448184-48-3 C23H32N6O5S
Dolutegravir 4-Desfluoro Impurity Dolutegravir 4-Desfluoro Impurity 1863916-87-3 C20H20FN3O5
Tetrabenazine Dehydro Impurity Tetrabenazine Dehydro Impurity 100322-43-8 C19H25NO3
Cefotiam Impurity 22 Cefotiam Impurity 22 1628441-07-5 C13H14N4O5S2
Dezocine Impurity 2 Dezocine Impurity 2 100667-17-2 C16H21NO
loteprednol Impurity 7 loteprednol Impurity 7 82034-20-6 C24H33ClO7
Sitagliptin Impurity 28 Sitagliptin Impurity 28 898543-70-9 C32H25F12N9O2
Vilanterol Impurity 3 Triphenylacetate Vilanterol Impurity 3 Triphenylacetate 503070-62-0 C23H31Cl2NO5
Empagliflozin Impurity 33 Empagliflozin Impurity 33
Sugammadex Impurity 21 Sugammadex Impurity 21 2412952-93-1 C72H113NaO48S8
4-((1,4,8,11-tetraazacyclotetradecan-1-yl)methyl)benzaldehyde trihydrochloride 4-((1,4,8,11-tetraazacyclotetradecan-1-yl)methyl)benzaldehyde trihydrochloride 1254176-45-8 C18H30N4O
3'-Deoxyneamine 3'-Deoxyneamine 34051-04-2 C12H26N4O5
Remifentanil Impurity 1 (RTF-02) Remifentanil Impurity 1 (RTF-02) 938184-94-2 C16H21N3O2
methyl (3aS,4R,6S,6aR)-4-((tert-butoxycarbonyl)amino)-3-(pentan-3-yl)-3a,5,6,6a-tetrahydro-4H-cyclopenta[d]isoxazole-6-carboxylate methyl (3aS,4R,6S,6aR)-4-((tert-butoxycarbonyl)amino)-3-(pentan-3-yl)-3a,5,6,6a-tetrahydro-4H-cyclopenta[d]isoxazole-6-carboxylate 383910-25-6 C18H30N2O5
sodium (((((R)-1-(6-amino-9H-purin-9-yl)propan-2-yl)oxy) methyl)oxidophosphoryl)-L-alaninate sodium (((((R)-1-(6-amino-9H-purin-9-yl)propan-2-yl)oxy) methyl)oxidophosphoryl)-L-alaninate 382140-24-1 C12H19N6O5P
N-Des-tetrahydrofuran N-(6,7-Dimethoxy-4,4a-dihydroquinazolin-4-amine) Alfuzosin N-Des-tetrahydrofuran N-(6,7-Dimethoxy-4,4a-dihydroquinazolin-4-amine) Alfuzosin 928780-95-4 C24H30N8O4
Zopiclone Impurity 13 Zopiclone Impurity 13
N-METHYLISATIN N-METHYLISATIN 2058-74-4 C9H7NO2
1-bromo-3-(4-ethoxybenzyl)benzene 1-bromo-3-(4-ethoxybenzyl)benzene 898538-17-5 C15H15BrO
(2S,3R,4R,5S,6R)-2-(4-chloro-3-((4-ethoxyphenyl)(methoxy) methyl)phenyl)-6-(hydroxymethyl)tetrahydro-2H-pyran-3,4,5-triol (2S,3R,4R,5S,6R)-2-(4-chloro-3-((4-ethoxyphenyl)(methoxy) methyl)phenyl)-6-(hydroxymethyl)tetrahydro-2H-pyran-3,4,5-triol 1318794-28-3 C22H27ClO7
Brivaracetam Impurity Brivaracetam Impurity 2432911-37-8 C11H22O3
Azithromycin EP Impurity K Azithromycin EP Impurity K
Cefminox Sodium impurity 5 Cefminox Sodium impurity 5
Moxifloxacin Impurity 37 Moxifloxacin Impurity 37 1803729-19-2 C7H3ClF2O2
Nimodipine Impurity 12 Nimodipine Impurity 12 39562-18-0 C19H22N2O6
Rosuvastatin Impurity 53 Rosuvastatin Impurity 53
Sulbactam Impurity 8 Sulbactam Impurity 8 75527-88-7 C8H10BrNO5S
Tenofovir Impurity 64 Tenofovir Impurity 64 1878175-76-8 C13H23N5O8P2
Ticagrelor Impurity 65 Ticagrelor Impurity 65
Ticagrelor Impurity 72 Ticagrelor Impurity 72 1402150-11-1 C24H28F2N6O5S
Topiroxostat Impurity 18 Topiroxostat Impurity 18
Isorhamnetin 3,7-O-diglucoside Isorhamnetin 3,7-O-diglucoside 6758-51-6 C28H32O17
Afatinib Impurity 26 Afatinib Impurity 26
Amifostine Impurity 5 Amifostine Impurity 5 712255-27-1 C5H9BrN2
Aztreonam Impurity 5 Aztreonam Impurity 5 2195336-17-3 C4H10N2O5S
Canagliflozin Impurity 35 Canagliflozin Impurity 35
Cefazolin Impurity 7 (Cefazolin Trimethylsilyl Ester) Cefazolin Impurity 7 (Cefazolin Trimethylsilyl Ester) 1072000-00-0 C17H22N8O4S3Si
Dapagliflozin Impurity 25 Dapagliflozin Impurity 25
Doripenem Impurity 1 Doripenem Impurity 1
Erlotinib Impurity 54 Erlotinib Impurity 54
Erlotinib Impurity 59 Erlotinib Impurity 59
Etoposide Impurity 5 Etoposide Impurity 5
Olaparib Impurity 26 Olaparib Impurity 26
Oseltamivir Impurity 14 Oseltamivir Impurity 14 2081110-44-1 C16H28N2O4
Rocuronium bromide Impurity 35 Rocuronium bromide Impurity 35
Adefovir Impurity 5 Adefovir Impurity 5
Apremilast Impurity QJ Apremilast Impurity QJ
Apremilast Impurity TTN Apremilast Impurity TTN
AZD9291 Osimertinib Impurity 1 AZD9291 Osimertinib Impurity 1
Dextrorotation lansoprazole Impurity I Dextrorotation lansoprazole Impurity I
Ivabradine Impurity 31 Ivabradine Impurity 31
lansoprazole Impurity 28 lansoprazole Impurity 28
Lincomycin sulfoxide Impurity 1 Lincomycin sulfoxide Impurity 1
Olanzapine impurity Q Olanzapine impurity Q C17H20N4S
Palbociclib Impurity 32 Palbociclib Impurity 32
Ropivacaine Impurity 32 Ropivacaine Impurity 32
Ropivacaine Impurity 41 Ropivacaine Impurity 41
Sugammadex sodium dimer Sugammadex sodium dimer
Sugammadex sodium Org49095 Impurity Sugammadex sodium Org49095 Impurity
Topiroxostat Impurity Ⅲ-2 Topiroxostat Impurity Ⅲ-2
Parecoxib Impurity 12 Parecoxib Impurity 12 2229657-81-0 C19H18N2O4S
Afatinib impurity 29 Afatinib impurity 29
Avibactam Impurity 44 Avibactam Impurity 44 2064219-22-1 C23H46N4O6S
Bortezomib Impurity W Bortezomib Impurity W
Butyphthalide impurity 43 Butyphthalide impurity 43 952412-99-6 C11H14O3
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