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Impurities

SynThink is a trusted producer and supplier of Pharmaceutical Reference Standards, including Impurity Standards. These materials are essential for pharmaceutical companies conducting research into the quality, stability, and biological safety of drug products. We maintain a robust inventory of API impurities, ready to support your development and regulatory needs.

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Ethinylestradiol, Impurities

Ethinylestradiol EP Impurity H

$525.00 10 mg

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CAS No.

: 1350468-76-6

Mol F.

: C20H22O3

Mol W.

: 310.39

Cat No.

: SA13105

Ethinylestradiol, Impurities

Ethinylestradiol EP Impurity J

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CAS No.

: 15071-66-6

Mol F.

: C21H26O2

Mol W.

: 310.43

Cat No.

: SA13128

Ethinylestradiol, Impurities

Ethinylestradiol EP Impurity K

$295.00 25 mg

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CAS No.

: 155683-61-7

Mol F.

: C21H26O2

Mol W.

: 310.43

Cat No.

: SA13120

Ethinylestradiol, Impurities

Ethinylestradiol EP Impurity M

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CAS No.

: 3240-39-9

Mol F.

: C21H26O2

Mol W.

: 310.44

Cat No.

: SA13114

Ethisterone, Impurities

Ethisterone

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CAS No.

: 434-03-7

Mol F.

: C₂₁H₂₈O₂

Mol W.

: 312.45

Cat No.

: SA12900

Gabapentin, Impurities

Ethyl [1-(nitromethyl)cyclohexyl]acetate

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CAS No.

: 133938-45-1

Mol F.

: C₁₁H₁₉NO₄

Mol W.

: 229.27

Cat No.

: SA22814

Argatroban, Impurities

Ethyl 2-(1-phenylethylimino)acetate

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CAS No.

: 35823-28-0

Mol F.

: C12H15NO2

Mol W.

: 205.25

Cat No.

: SA48417

Impurities, Ticagrelor

Ethyl 2-[[(3aR,4S,6R,6aS)-6-Amino-2,2-dimethyltetrahydro-3aH-cyclopenta[d][1,3]dioxol-4-yl]oxy]acetate oxalate

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CAS No.

: 1402149-98-7 (Oxalate); 1265919-24-1 (Base)

Mol F.

: C14H23NO9

Mol W.

: 259.3

Cat No.

: SA32511

Febuxostat, Impurities

Ethyl 2-[2-isobutoxy-5-(5-methoxycarbonyl-4-methyl-1,3-thiazol-2-yl)phenyl]-4-methyl-1,3-thiazole-5-carboxylate

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CAS No.

: NA

Mol F.

: C23H26N2O5S2

Mol W.

: 474.6

Cat No.

: SA32021

Benazepril, Impurities

Ethyl 2-oxo-4-phenylbutyrate

$79.00 25 mg

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CAS No.

: 64920-29-2

Mol F.

: C₁₂H₁₄O₃

Mol W.

: 206.24

Cat No.

: SA29608

Impurities, Sitagliptin

Ethyl 3-(((Benzyloxy)carbonyl)amino)-4-(2,4,5-trifluorophenyl)butanoate

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CAS No.

Mol F.

: C20H20F3NO4

Mol W.

: 395.37

Cat No.

: SA10436

Impurities, Tofacitinib

Ethyl 3-((3R,4R)-4-methyl-3-(methyl(7H-pyrrolo[2,3-d]pyrimidin-4-yl)amino)piperidin-1-yl)-3-oxopropanoate

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CAS No.

: 1675248-18-6

Mol F.

: C18H25N5O3

Mol W.

: 359.43

Cat No.

: SA43310

Impurities, Sitagliptin

Ethyl 3-Amino-4-(2,4,5-trifluorophenyl)butanoate

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CAS No.

: 1151240-92-4

Mol F.

: C12H14F3NO2

Mol W.

: 261.24

Cat No.

: SA10435

Gemcitabine, Impurities

Ethyl 3-O-benzoyl-2-deoxy-2,2-difluoro-4,5-O-isopropylidene-D-ery thro-pentonate

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CAS No.

: 143234-90-6

Mol F.

: C17H20F2O6

Mol W.

: 358.33

Cat No.

: SA44504

Erlotinib, Impurities

Ethyl 3,4-Dihydroxybenzoate

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CAS No.

: 3943-89-3

Mol F.

: C9H10O4

Mol W.

: 182.18

Cat No.

: SA25226

Impurities, Olmesartan Medoxomil

Ethyl 4-(2-Hydroxy-2-propyl)-2-propyl-1H-imidazole-5-carboxylate

$125.00 25 mg

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CAS No.

: 144689-93-0

Mol F.

: C12H20N2O3

Mol W.

: 240.3

Cat No.

: SA17731

Impurities, Rosuvastatin

Ethyl 4-(4-Fluorophenyl)-6-isopropyl-2-(methylsulfonyl)pyrimidine-5-carboxylate

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CAS No.

: 147118-28-3

Mol F.

: C17H19FN2O4S

Mol W.

: 366.41

Cat No.

: SA12111

Impurities, Rosuvastatin

Ethyl 4-(4-Fluorophenyl)-6-isopropyl-2-(N-methylsulfonamido)pyrimidine-5-carboxylate

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CAS No.

: 1035595-71-1

Mol F.

: C17H20FN3O4S

Mol W.

: 381.42

Cat No.

: SA12110

Impurities, Rosuvastatin

Ethyl 4-(4-Fluorophenyl)-6-isopropyl-2-amino-pyrimidine-5-carboxylate

$200.00 25 mg

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CAS No.

: 712320-67-7

Mol F.

: C16H18FN3O2

Mol W.

: 303.33

Cat No.

: SA12109

Impurities, Rosuvastatin

Ethyl 4-(4-Fluorophenyl)-6-isopropyl-2-methylthiopyrimidine-5-carboxylate

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CAS No.

: 147118-27-2

Mol F.

: C17H19FN2O2S

Mol W.

: 334.41

Cat No.

: SA12112

Glyburide, Impurities

Ethyl 4-[2-(5-Chloro-2-methoxybenzamido)ethyl]benzene Sulfonamide Carbamate

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CAS No.

: 14511-59-2

Mol F.

: C₁₉H₂₁ClN₂O₆S

Mol W.

: 440.9

Cat No.

: SA12301

Impurities, Rosuvastatin

ethyl 4-methylbenzenesulfonate

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CAS No.

: 80-40-0

Mol F.

: C9H12O3S

Mol W.

: 200.25

Cat No.

: SA121119

Gabapentin, Impurities

Ethyl Cyanocyclohexylideneacetate

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CAS No.

: 6802-76-2

Mol F.

: C₁₁H₁₅NO₂

Mol W.

: 193.24

Cat No.

: SA22811

Impurities, Leflunomide

Ethyl-2-ethoxymehyledene-3-oxobutonoate | CAS NO : 66975-53-9

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CAS No.

: 66975-53-9

Mol F.

: C9H14O4

Mol W.

: 186.21

Cat No.

: SA21820

Impurities, Leflunomide

Ethyl-5-methyl isoxazole carboxylic acid | CAS NO : 51135-73-0

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CAS No.

: 51135-73-0

Mol F.

: C7H9NO3

Mol W.

: 155.15

Cat No.

: SA21821

Apixaban, Impurities

Ethyl(Z)-2-chloro-2-(2-(4-methoxyphenyl)-2-nitrosohydrazineylidene) acetate

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CAS No.

Mol F.

: C11H12ClN3O4

Mol W.

: 285.68

Cat No.

: SA39949

Impurities, Nitrosamine

Ethyl(Z)-2-chloro-2-(2-(4-methoxyphenyl)-2-nitrosohydrazineylidene) acetate

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CAS No.

Mol F.

: C11H12ClN3O4

Mol W.

: 285.68

Cat No.

: SA44697

Etravirine, Impurities

Etravirine

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CAS No.

: 269055-15-4(Base);1030633-38-5(HBrSalt)

Mol F.

: C20H15BrN6O

Mol W.

: 435.28

Cat No.

: SA26100

Etravirine, Impurities

Etravirine 6-Dimer Impurity

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CAS No.

: 1704730-70-0

Mol F.

: C29H21BrN6O2

Mol W.

: 565.41999999999996

Cat No.

: SA26112

Etravirine, Impurities

Etravirine butanamide Impurity

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CAS No.

: 2240161-92-4

Mol F.

: C25H24BrN7O2

Mol W.

: 534.4

Cat No.

: SA26113

Etravirine, Impurities

Etravirine Chloro Impurity

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CAS No.

: 269055-19-8

Mol F.

: C20H15ClN6O

Mol W.

: 390.83

Cat No.

: SA26110

Etravirine, Impurities

Etravirine N-Oxide Impurity

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CAS No.

: 907180-19-2

Mol F.

: C20H15BrN6O2

Mol W.

: 451.28

Cat No.

: SA26108

Exemestane, Impurities

Exemestane

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CAS No.

: 107868-30-4

Mol F.

: C20H24O2

Mol W.

: 296.39999999999998

Cat No.

: SA19100

Exemestane, Impurities

Exemestane ±β-Spirooxirane

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CAS No.

: NA

Mol F.

: C20H26O3

Mol W.

: 314.42

Cat No.

: SA19129

Exemestane, Impurities

Exemestane 3-ethoxy Impurity

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CAS No.

: NA

Mol F.

: C22H32O2

Mol W.

: 328.5

Cat No.

: SA19103

Exemestane, Impurities

Exemestane 6-Hydroxymethyl Impurity

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CAS No.

: 152764-26-6

Mol F.

: C₂₀H₂₄O₃

Mol W.

: 312.39999999999998

Cat No.

: SA19122

Exemestane, Impurities

Exemestane Diol Impurity

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CAS No.

: 184972-11-0

Mol F.

: C₂₀H₂₆O₄

Mol W.

: 330.42

Cat No.

: SA19121

Exemestane, Impurities

Exemestane EP Impurity B

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CAS No.

: 184972-09-6

Mol F.

: C20H26O3

Mol W.

: 314.42

Cat No.

: SA19127

Exemestane, Impurities

Exemestane EP Impurity C

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CAS No.

: 2130745-60-5

Mol F.

: C21H24O2

Mol W.

: 308.42

Cat No.

: SA19105

Exemestane, Impurities

Exemestane Impurity 24 Mixture

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CAS No.

Mol F.

: C20H24O3

Mol W.

: 312.4

Cat No.

: SA19139

Exemestane, Impurities

Exemestane Related Compound D

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CAS No.

: 2467590-81-2

Mol F.

: C20H24O2

Mol W.

: 296.41

Cat No.

: SA19104

Ezetimibe, Impurities

Ezetimibe 2-Fluoro Impurity

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CAS No.

: 2191318-99-5

Mol F.

: C24H21F2NO3

Mol W.

: 409.44

Cat No.

: SA14829

Ezetimibe, Impurities

Ezetimibe 2-hydroxyphenyl Isomer

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CAS No.

Mol F.

: C24H21F2NO3

Mol W.

: 409.15

Cat No.

: SA14859

Ezetimibe, Impurities

Ezetimibe 3-hydroxyphenyl Isomer

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CAS No.

Mol F.

: C24H21F2NO3

Mol W.

: 409.43

Cat No.

: SA14860

Ezetimibe, Impurities

Ezetimibe Diacid Impurity

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CAS No.

: 1013025-04-1

Mol F.

: C25H24FNO5

Mol W.

: 437.46

Cat No.

: SA14804

Ezetimibe, Impurities

Ezetimibe Diastereomers (R,R,R and S,S,S)

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CAS No.

Mol F.

: C24H21F2NO3

Mol W.

: 409.43

Cat No.

: SA14852

Ezetimibe, Impurities

Ezetimibe Hydroxy Glucuronide

$995.00 25 mg

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CAS No.

: 536709-33-8

Mol F.

: C30H29F2NO9

Mol W.

: 585.56

Cat No.

: SA14824

Ezetimibe, Impurities

Ezetimibe Lactam Cleaved Alcohol; 3’-Anhydro Ezetimibe Alcohol Impurity

$995.00 25 mg

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CAS No.

: 1374250-07-3

Mol F.

: C24H23F2NO2

Mol W.

: 395.45

Cat No.

: SA14817

Ezetimibe, Impurities

Ezetimibe meta-Fluorobenzene Isomer

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CAS No.

Mol F.

: C24H21F2NO3

Mol W.

: 409.43

Cat No.

: SA14858

Ezetimibe, Impurities

Ezetimibe Phenexy Glucuronide

$950.00 25 mg

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CAS No.

: 190448-57-8

Mol F.

: C30H29F2NO9

Mol W.

: 585.56

Cat No.

: SA14823