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Impurities

SynThink is a producer and supplier of a number of pharmaceutical Reference Standards (Impurity Standards) which are required for pharmaceutical companies to study quality, stability and biological safety of pharmaceutical products. Many API Impurities are available in our stock.

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Bumetanide, Impurities

Ethacrynic Acid Mercapturate (Mixture of diastereomers)

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Out of Stock

CAS No.

: 54546-23-5

Mol F.

: C18H21Cl2NO7S

Mol W.

: 466.33

Cat No.

: SA24408

Ethinylestradiol, Impurities

Ethinylestradiol 1-Hydroxy 4-Methyl Impurity

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Out of Stock

CAS No.

: 1034298-00-4

Mol F.

: C21H26O2

Mol W.

: 310.43

Cat No.

: SA13136

Ethinylestradiol, Impurities

Ethinylestradiol 17-Acetate

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Out of Stock

CAS No.

: 21221-29-4

Mol F.

: C22H26O3

Mol W.

: 338.44

Cat No.

: SA13122

Ethinylestradiol, Impurities

Ethinylestradiol 3-Acetate

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Out of Stock

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

Out of Stock

CAS No.

: 24560-70-1

Mol F.

: C20H24O5S

Mol W.

: 376.47

Cat No.

: SA13118

Ethinylestradiol, Impurities

Ethinylestradiol 3-Sulfate Sodium Salt

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Out of Stock

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

Out of Stock

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

Out of Stock

CAS No.

: 13258-68-9

Mol F.

: C24H28O4

Mol W.

: 380.48

Cat No.

: SA13123

Ethinylestradiol, Impurities

Ethinylestradiol EP Impurity C

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Out of Stock

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

Out of Stock

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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Out of Stock

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

Out of Stock

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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Out of Stock

CAS No.

: 3240-39-9

Mol F.

: C21H26O2

Mol W.

: 310.44

Cat No.

: SA13114

Ethisterone, Impurities

Ethisterone

Please enquire for price & pack size

Out of Stock

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

Out of Stock

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

Out of Stock

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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Out of Stock

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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Out of Stock

CAS No.

: NA

Mol F.

: C23H26N2O5S2

Mol W.

: 474.6

Cat No.

: SA32021

Benazepril, Impurities

Ethyl 2-oxo-4-phenylbutyrate

$79.00 25 mg

Out of Stock

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

Out of Stock

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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Out of Stock

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

Out of Stock

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

Out of Stock

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

Out of Stock

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

Out of Stock

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

Out of Stock

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

Out of Stock

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

Out of Stock

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

Out of Stock

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

Out of Stock

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

Out of Stock

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

Out of Stock

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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Out of Stock

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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Out of Stock

CAS No.

: 51135-73-0

Mol F.

: C7H9NO3

Mol W.

: 155.15

Cat No.

: SA21821

Impurities, Nitrosamine

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

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C11H12ClN3O4

Mol W.

: 285.68

Cat No.

: SA44697

Apixaban, Impurities

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

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C11H12ClN3O4

Mol W.

: 285.68

Cat No.

: SA39949

Etravirine, Impurities

Etravirine

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

CAS No.

: 1704730-70-0

Mol F.

: C29H21BrN6O2

Mol W.

: 565.41999999999996

Cat No.

: SA26112

Etravirine, Impurities

Etravirine butanamide Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 2240161-92-4

Mol F.

: C25H24BrN7O2

Mol W.

: 534.4

Cat No.

: SA26113

Etravirine, Impurities

Etravirine Chloro Impurity

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Out of Stock

CAS No.

: 269055-19-8

Mol F.

: C20H15ClN6O

Mol W.

: 390.83

Cat No.

: SA26110

Etravirine, Impurities

Etravirine N-Oxide Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 907180-19-2

Mol F.

: C20H15BrN6O2

Mol W.

: 451.28

Cat No.

: SA26108

Etynodiol, Impurities

Etynodiol

Please enquire for price & pack size

Out of Stock

CAS No.

: 1231-93-2

Mol F.

: C20H28O2

Mol W.

: C20H28O2

Cat No.

: SA16901

Exemestane, Impurities

Exemestane

Please enquire for price & pack size

Out of Stock

CAS No.

: 107868-30-4

Mol F.

: C20H24O2

Mol W.

: 296.39999999999998

Cat No.

: SA19100

Exemestane, Impurities

Exemestane ±β-Spirooxirane

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C20H26O3

Mol W.

: 314.42

Cat No.

: SA19129

Exemestane, Impurities

Exemestane 3-ethoxy Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C22H32O2

Mol W.

: 328.5

Cat No.

: SA19103

Exemestane, Impurities

Exemestane 6-Hydroxymethyl Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 152764-26-6

Mol F.

: C₂₀H₂₄O₃

Mol W.

: 312.39999999999998

Cat No.

: SA19122

Exemestane, Impurities

Exemestane Diol Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 184972-11-0

Mol F.

: C₂₀H₂₆O₄

Mol W.

: 330.42

Cat No.

: SA19121

Exemestane, Impurities

Exemestane EP Impurity B

Please enquire for price & pack size

Out of Stock

CAS No.

: 184972-09-6

Mol F.

: C20H26O3

Mol W.

: 314.42

Cat No.

: SA19127

Exemestane, Impurities

Exemestane EP Impurity C

Please enquire for price & pack size

Out of Stock

CAS No.

: 2130745-60-5

Mol F.

: C21H24O2

Mol W.

: 308.42

Cat No.

: SA19105

Exemestane, Impurities

Exemestane Impurity 24 Mixture

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C20H24O3

Mol W.

: 312.4

Cat No.

: SA19139