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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Ampicillin Impurity B Ampicillin Impurity B
Clindamycin Phosphate EP Impurity K Clindamycin Phosphate EP Impurity K
7,7'-(butane-1,4-diylbis(oxy))bis(quinolin-2(1H)-one) 7,7'-(butane-1,4-diylbis(oxy))bis(quinolin-2(1H)-one) 2116542-19-7 C22H20N2O4
Descyclopropyl Lenvatinib Descyclopropyl Lenvatinib 417719-51-8 C18H15ClN4O4
3-Piperidinemethanol, 4-(4-fluorophenyl)-1-methyl-, (3R,4R)-rel- 3-Piperidinemethanol, 4-(4-fluorophenyl)-1-methyl-, (3R,4R)-rel- 54088-21-0 C13H18FNO
1'-Hydroxy Bilastine 1'-Hydroxy Bilastine 1638785-23-5 C28H37N3O4
Brexpiprazole Impurity 4 Brexpiprazole Impurity 4 2116542-20-0 C25H27N3O2S
Fosaprepitant Impurity 5 Fosaprepitant Impurity 5 327623-35-8 C21H19F6NO3
Moxifloxacin Ethyl Ester Moxifloxacin Ethyl Ester 1403836-23-6 C23H28FN3O4
Pantoprazole Impurity 5 Pantoprazole Impurity 5 1806469-15-7 C8H6F2N2O2
Venlafaxine Impurity 5 Venlafaxine Impurity 5 1346600-77-8 C17H27NO2
N-(4-methyl-3-(4-methyl-6-(pyridin-3-yl)pyrimidin-2-ylamino)phenyl)-4-((4-methylpiperazin-1-yl)methyl)benzamide N-(4-methyl-3-(4-methyl-6-(pyridin-3-yl)pyrimidin-2-ylamino)phenyl)-4-((4-methylpiperazin-1-yl)methyl)benzamide C30H33N7O
Exemestane impurity B -F Exemestane impurity B -F 184972-09-6 C20H26O3
Fesoterodine Impurity 8 Fesoterodine Impurity 8 1380491-71-3 C48H66N2O4
QBWNUEJPRUVNTD-FOIQADDNSA-N QBWNUEJPRUVNTD-FOIQADDNSA-N 1346602-17-2 C22H17N3O5
C-Desmethyl Metoprolol C-Desmethyl Metoprolol 109632-08-8 C14H23NO3
JZWUWLJCMMPASK-YTSMVRMISA-N JZWUWLJCMMPASK-YTSMVRMISA-N 147103-95-5 C24H24N4O7S
KXEITTOLAUJQPU-UHFFFAOYSA-N KXEITTOLAUJQPU-UHFFFAOYSA-N 1797832-43-9 C20H21N7O2S
GPZGXSFHPLUMHE-KEUNHQLVSA-N GPZGXSFHPLUMHE-KEUNHQLVSA-N 157054-84-7 C52H81NO13
IRLGOHSHDYCIAB-ZMVBZRCWSA-N IRLGOHSHDYCIAB-ZMVBZRCWSA-N 1076198-14-5 C19H23F3N2O5
AOEGVETYSHPGBP-XYIDDFOTSA-N AOEGVETYSHPGBP-XYIDDFOTSA-N 1887057-05-7 C41H55NO14
4,6-DIAMINOINDAZOLE 4,6-DIAMINOINDAZOLE 885518-52-5 C7H8N4
12-Deoxy Roxithromycin 12-Deoxy Roxithromycin 425365-65-7 C41H76N2O14
1-(1-oxidopyridin-1-ium-2-yl)-1-phenylethanol 1-(1-oxidopyridin-1-ium-2-yl)-1-phenylethanol 100393-43-9 C13H13NO2
(R)-(R)-1-methylpyrrolidin-3-yl 2-cyclopentyl-2-hydroxy-2-phenylacetate(WXC03446) (R)-(R)-1-methylpyrrolidin-3-yl 2-cyclopentyl-2-hydroxy-2-phenylacetate(WXC03446) 616866-21-8 C18H25NO3
(R)-2-((6-(3-aminopiperidin-1-yl)-3-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)methyl)benzoic acid (R)-2-((6-(3-aminopiperidin-1-yl)-3-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)methyl)benzoic acid C18H22N4O4
6'-methyl-3-(4-(methylsulfonyl)phenyl)-[2,3'-bipyridin]-5-amine 6'-methyl-3-(4-(methylsulfonyl)phenyl)-[2,3'-bipyridin]-5-amine C18H17N3O2S
Diquafosol Impurity 4 Diquafosol Impurity 4
Tofacitinib Impurity X Tofacitinib Impurity X
3-pentylideneisobenzofuran-1(3H)-one 3-pentylideneisobenzofuran-1(3H)-one 90965-68-7 C13H14O2
Labetalol EP impurity E Labetalol EP impurity E
1-Propanol, 3-(2-methoxy-5-nitrophenoxy)- 1-Propanol, 3-(2-methoxy-5-nitrophenoxy)- 1156068-41-5 C10H13NO5
Kaempferol-3-rhamnoglucoside-7-glucoside Kaempferol-3-rhamnoglucoside-7-glucoside 34336-18-0 C33H40O20
Mupirocin iMpurity 2 Mupirocin iMpurity 2 C26H44O9
Cytarabine Impurity 10 Cytarabine Impurity 10 32830-01-6 C9H11N3O4
Ceftriaxone Sodium impurity 5 Ceftriaxone Sodium impurity 5
Sugammadex sodium Org48302 Impurity Sugammadex sodium Org48302 Impurity
176761-00-5 176761-00-5 176761-00-5 C17H15FN2O5
Pramipexole Impurity W Pramipexole Impurity W
Aprepitant Impurity 44 Aprepitant Impurity 44 172676-88-9 C23H21F7N4O3
Oseltamivir Impurity 26 Oseltamivir Impurity 26 241465-24-7
Afatinib Impurity I Afatinib Impurity I
Moxifloxacin Impurity 5 Moxifloxacin Impurity 5
Moxifloxacin Impurity 24 Moxifloxacin Impurity 24
Fosaprepitant Impurity 1 Fosaprepitant Impurity 1
Ticagrelor Impurity 1 Ticagrelor Impurity 1
Ezetimibe Impurity 36 Ezetimibe Impurity 36
Pitavastatin Impurity 2 Pitavastatin Impurity 2
Fudosteine Impurity 2 Fudosteine Impurity 2
Sugammadex Impurity 18 Sugammadex Impurity 18
Mirabegron Impurity 21 Mirabegron Impurity 21
Apixaban Impurity 18 Apixaban Impurity 18 473927-65-0 C20H17IN4O3
Clopidogrel Impurity 12 Clopidogrel Impurity 12 C15H14ClNO2S
Oseltamivir Impurity 25 Oseltamivir Impurity 25
Ritonavir EP Impurity P Ritonavir EP Impurity P
Tacrolimus Impurity 4 Tacrolimus Impurity 4 686773-61-5 C44H69NO12
(2R,4S)-isopropyl5-([1,1'-biphenyl]-4-yl)-4-(2,5-dioxopyrrolidin-1- yl)-2-methylpentanoate (2R,4S)-isopropyl5-([1,1'-biphenyl]-4-yl)-4-(2,5-dioxopyrrolidin-1- yl)-2-methylpentanoate C25H29NO4
methyl 3-(4-(2-hydroxy-3-(isopropylamino)propoxy)phenyl)-3- oxopropanoate hydrochloride methyl 3-(4-(2-hydroxy-3-(isopropylamino)propoxy)phenyl)-3- oxopropanoate hydrochloride C16H24ClNO5
Aprepitant iMpurity 37 Aprepitant iMpurity 37
Vitamin E Impurity 3 Vitamin E Impurity 3 1560705-69-2 C29H50O2
(trans)-phenyl3-((benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4'-fluoro-[1,1'-biphenyl]-3-yl)piperidine-1-carboxylate (trans)-phenyl3-((benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4'-fluoro-[1,1'-biphenyl]-3-yl)piperidine-1-carboxylate C32H28FNO5
arformoterol tartrate impurity arformoterol tartrate impurity
Cefraprazole impurity Cefraprazole impurity
Afatinib Impurity QAQ Afatinib Impurity QAQ
Afatinib Impurity SHO Afatinib Impurity SHO 2223677-65-2 C38H30Cl2F2N8O6
Androstan-17-one,3-[[(4-methylphenyl)sulfonyl]oxy]-,(3,5)- Androstan-17-one,3-[[(4-methylphenyl)sulfonyl]oxy]-,(3,5)- 10429-07-9 C26H36O4S
Cabozantinib Impurity 48 Cabozantinib Impurity 48 202916-99-2 C17H15NO3
Landiolol impurity R Landiolol impurity R
6-Oxo-Palonosetron 6-Oxo-Palonosetron 848074-10-2 C19H22N2O2
Teneligliptin Impurity 8 Teneligliptin Impurity 8
(trans)-4-(4'-fluoro-[1,1'-biphenyl]-3-yl)-1-methylpiperidin-3-yl) methanol (trans)-4-(4'-fluoro-[1,1'-biphenyl]-3-yl)-1-methylpiperidin-3-yl) methanol
2,4(1H,3H)-Pyrimidinedione, 3-[[2-fluoro-6-(trifluoromethyl)phenyl]methyl]-6-methyl- 2,4(1H,3H)-Pyrimidinedione, 3-[[2-fluoro-6-(trifluoromethyl)phenyl]methyl]-6-methyl- 2354391-45-8 C13H10F4N2O2
Cyclopropane, nitroso- Cyclopropane, nitroso- 28017-92-7 C3H5NO
Hyoscine Butylbromide EP Impurity D Hyoscine Butylbromide EP Impurity D
Carbetocin Impurity 1 Carbetocin Impurity 1
Carboprost Trometamol Impurity A Carboprost Trometamol Impurity A
Procaine Impurity 2 Procaine Impurity 2 C13H20N2O2
Triphenylmethanol (Zidovudine impurity) Triphenylmethanol (Zidovudine impurity) C19H16O
Benzenesulfonamide, 2-(5-methyl-3-phenyl-4-isoxazolyl)- Benzenesulfonamide, 2-(5-methyl-3-phenyl-4-isoxazolyl)- 2304623-35-4 C16H14N2O3S
Amylmetacresol EP impurity A Amylmetacresol EP impurity A 876473-73-3 C12H18O
5-methyl-2-(2-methylbutyl)phenol 5-methyl-2-(2-methylbutyl)phenol C12H18O
N-(4-methyl-3-((5-(pyridin-3-yl) N-(4-methyl-3-((5-(pyridin-3-yl)
7-methyl-3,4-dihydropyrimido 7-methyl-3,4-dihydropyrimido
4'-hydroxy-3'-nitro-[1,1'-biphenyl]-3-carboxylic acid 4'-hydroxy-3'-nitro-[1,1'-biphenyl]-3-carboxylic acid 1097777-60-0 C13H9NO5
Dapagliflozin Impurity (MW: 425Da) Dapagliflozin Impurity (MW: 425Da)
Sugammadex Monochloro Impurity Sugammadex Monochloro Impurity
Oseltamivir Impurity (MW:468Da) Oseltamivir Impurity (MW:468Da)
Levothyroxine – Impurity 5 Levothyroxine – Impurity 5
Ibuprofen IPA impurity Ibuprofen IPA impurity
Voriconazole Impurity 19 Voriconazole Impurity 19 321589-01-9 C26H28F3N5O4S
Salbutamol Impurity 38 Salbutamol Impurity 38
Gadobutrol Impurity 4 (Gd-DOTA) Gadobutrol Impurity 4 (Gd-DOTA)
Losartan Impurity 3 Losartan Impurity 3
methyl 2-((4R,6R)-6-(2-(2-(4-fluorophenyl)-5-isopropyl-3-phenyl-4- (phenylcarbamoyl)-1H-pyrrol-1-yl)ethyl)-2,2-dimethyl-1,3-dioxan-4- yl)acetate methyl 2-((4R,6R)-6-(2-(2-(4-fluorophenyl)-5-isopropyl-3-phenyl-4- (phenylcarbamoyl)-1H-pyrrol-1-yl)ethyl)-2,2-dimethyl-1,3-dioxan-4- yl)acetate 1353049-81-6 C37H41FN2O5
Cilastatin EP Impurity G Cilastatin EP Impurity G
Rosuvastatin Impurity 122 Rosuvastatin Impurity 122 135999-58-5 C6H7ClO3
Anastrozole Impurity IV Anastrozole Impurity IV
NA NA
NA NA
Tinidazole Impurity B Tinidazole Impurity B
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