Home / Products / Impurities

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.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Estriol, Impurities

Estriol

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 50-27-1

Mol F.

: C18H24O3

Mol W.

: 288.38

Cat No.

: SA16100

Estriol, Impurities

Estriol EP Impurity A

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 246021-20-5

Mol F.

: C18H22O3

Mol W.

: 286.37

Cat No.

: SA16101

Estriol, Impurities

Estriol EP Impurity B

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 53-16-7

Mol F.

: C18H22O2

Mol W.

: 270.37

Cat No.

: SA16102

Estriol, Impurities

Estriol EP Impurity C

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1474-53-9

Mol F.

: C19H26O3

Mol W.

: 302.41

Cat No.

: SA16103

Estriol, Impurities

Estriol EP Impurity D

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 50-28-2

Mol F.

: C18H24O2

Mol W.

: 272.38

Cat No.

: SA16104

Estriol, Impurities

Estriol EP Impurity E

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1228-72-4

Mol F.

: C18H24O3

Mol W.

: 288.38

Cat No.

: SA16105

Estriol, Impurities

Estriol EP Impurity F

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 547-81-9

Mol F.

: C18H24O3

Mol W.

: 288.38

Cat No.

: SA16106

Estriol, Impurities

Estriol EP Impurity G

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 793-89-5

Mol F.

: C18H24O3

Mol W.

: 288.38

Cat No.

: SA16107

Estriol, Impurities

Estriol EP Impurity H

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 566-76-7

Mol F.

: C18H22O3

Mol W.

: 286.37

Cat No.

: SA16108

Estriol, Impurities

Estriol EP Impurity I

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 15370-49-7

Mol F.

: C18H22O3

Mol W.

: 286.37

Cat No.

: SA16109

Estrone, Impurities

Estrone sodium sulfate

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 438-67-5

Mol F.

: C18H21NaO5S

Mol W.

: C18H21NaO5S

Cat No.

: SA16010

Ethacrynic Acid, Impurities

Ethacrynic Acid

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 58-54-8

Mol F.

: C13H12Cl2O4

Mol W.

: 303.14

Cat No.

: SA30900

Ethacrynic Acid, Impurities

Ethacrynic Acid EP Impurity A

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1217-67-0

Mol F.

: C12H12Cl2O4

Mol W.

: 291.13

Cat No.

: SA30901

Ethacrynic Acid, Impurities

Ethacrynic Acid EP Impurity B

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 27929-18-6

Mol F.

: C₁₃H₁₃Cl₃O₄

Mol W.

: 339.6

Cat No.

: SA30902

Ethacrynic Acid, Impurities

Ethacrynic Acid EP Impurity C

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 25355-92-4

Mol F.

: C26H24Cl4O8

Mol W.

: 606.28

Cat No.

: SA30903

Ethacrynic Acid, Impurities

Ethacrynic Acid Impurity E

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 55507-91-0

Mol F.

: C12H10Cl2O4

Mol W.

: 289.11

Cat No.

: SA30904

Bumetanide, Impurities

Ethacrynic Acid L-Cysteine Adduct

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 51246-37-8

Mol F.

: C16H19Cl2NO6S

Mol W.

: 424.3

Cat No.

: SA24407

Bumetanide, Impurities

Ethacrynic Acid Mercapturate (Mixture of diastereomers)

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 54546-23-5

Mol F.

: C18H21Cl2NO7S

Mol W.

: 466.33

Cat No.

: SA24408

Ethinylestradiol, Impurities

Ethinylestradiol 1-Hydroxy 4-Methyl Impurity

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 1034298-00-4

Mol F.

: C21H26O2

Mol W.

: 310.43

Cat No.

: SA13136

Ethinylestradiol, Impurities

Ethinylestradiol 17-Acetate

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 21221-29-4

Mol F.

: C22H26O3

Mol W.

: 338.44

Cat No.

: SA13122

Ethinylestradiol, Impurities

Ethinylestradiol 3-Acetate

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 5779-47-5

Mol F.

: C22H26O3

Mol W.

: 338.44

Cat No.

: SA13121

Ethinylestradiol, Impurities

Ethinylestradiol 3-Sulfate

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 24560-70-1

Mol F.

: C20H24O5S

Mol W.

: 376.47

Cat No.

: SA13118

Ethinylestradiol, Impurities

Ethinylestradiol 3-Sulfate Sodium Salt

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 724762-79-2

Mol F.

: C20H23NaO5S

Mol W.

: 398.45

Cat No.

: SA13137

Ethinylestradiol, Impurities

Ethinylestradiol Delta-8(9) Impurity

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 100019-04-3

Mol F.

: C20H22O2

Mol W.

: 294.39

Cat No.

: SA13108

Ethinylestradiol, Impurities

Ethinylestradiol Diacetate

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 13258-68-9

Mol F.

: C24H28O4

Mol W.

: 380.48

Cat No.

: SA13123

Ethinylestradiol, Impurities

Ethinylestradiol EP Impurity C

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 53-16-7

Mol F.

: C18H22O2

Mol W.

: 270.37

Cat No.

: SA13138

Ethinylestradiol, Impurities

Ethinylestradiol EP Impurity H

$525.00 10 mg

PLEASE ENQUIRE

CAS No.

: 1350468-76-6

Mol F.

: C20H22O3

Mol W.

: 310.39

Cat No.

: SA13105

Ethinylestradiol, Impurities

Ethinylestradiol EP Impurity J

Please enquire for price & pack size

PLEASE ENQUIRE

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

PLEASE ENQUIRE

CAS No.

: 155683-61-7

Mol F.

: C21H26O2

Mol W.

: 310.43

Cat No.

: SA13120

Ethinylestradiol, Impurities

Ethinylestradiol EP Impurity M

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 3240-39-9

Mol F.

: C21H26O2

Mol W.

: 310.44

Cat No.

: SA13114

Ethisterone, Impurities

Ethisterone

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 434-03-7

Mol F.

: C₂₁H₂₈O₂

Mol W.

: 312.45

Cat No.

: SA12900

Gabapentin, Impurities

Ethyl [1-(nitromethyl)cyclohexyl]acetate

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 133938-45-1

Mol F.

: C₁₁H₁₉NO₄

Mol W.

: 229.27

Cat No.

: SA22814

Argatroban, Impurities

Ethyl 2-(1-phenylethylimino)acetate

Please enquire for price & pack size

PLEASE ENQUIRE

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

Please enquire for price & pack size

PLEASE ENQUIRE

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

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: NA

Mol F.

: C23H26N2O5S2

Mol W.

: 474.6

Cat No.

: SA32021

Benazepril, Impurities

Ethyl 2-oxo-4-phenylbutyrate

$79.00 25 mg

PLEASE ENQUIRE

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

Please enquire for price & pack size

PLEASE ENQUIRE

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

Please enquire for price & pack size

PLEASE ENQUIRE

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

Please enquire for price & pack size

PLEASE ENQUIRE

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

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 143234-90-6

Mol F.

: C17H20F2O6

Mol W.

: 358.33

Cat No.

: SA44504

Erlotinib, Impurities

Ethyl 3,4-Dihydroxybenzoate

Please enquire for price & pack size

PLEASE ENQUIRE

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

PLEASE ENQUIRE

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

Please enquire for price & pack size

PLEASE ENQUIRE

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

Please enquire for price & pack size

PLEASE ENQUIRE

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

PLEASE ENQUIRE

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

Please enquire for price & pack size

PLEASE ENQUIRE

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

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 14511-59-2

Mol F.

: C₁₉H₂₁ClN₂O₆S

Mol W.

: 440.9

Cat No.

: SA12301

Impurities, Rosuvastatin

ethyl 4-methylbenzenesulfonate

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 80-40-0

Mol F.

: C9H12O3S

Mol W.

: 200.25

Cat No.

: SA121119

Gabapentin, Impurities

Ethyl Cyanocyclohexylideneacetate

Please enquire for price & pack size

PLEASE ENQUIRE

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

Please enquire for price & pack size

PLEASE ENQUIRE

CAS No.

: 66975-53-9

Mol F.

: C9H14O4

Mol W.

: 186.21

Cat No.

: SA21820