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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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Impurities, Sulpiride

5-Sulphosalicylic Acid

Please enquire for price & pack size

Out of Stock

CAS No.

: 97-05-2

Mol F.

: C7H6O6S

Mol W.

: 218.19

Cat No.

: SA10910

Impurities, Indacaterol

5,6-Diethyl-2,3-dihydro-1H-inden-2-amine

Please enquire for price & pack size

Out of Stock

CAS No.

: 312753-70-1

Mol F.

: C13H19N

Mol W.

: 189.3

Cat No.

: SA48711

Impurities, Midazolam

5,6-Dihydro Midazolam

Please enquire for price & pack size

Out of Stock

CAS No.

: 59468-07-4

Mol F.

: C18H15ClFN3

Mol W.

: 327.8

Cat No.

: SA44308

Impurities, Isoquinoline

5,7-dimethoxy-3,4-dihydroisoquinoline

Please enquire for price & pack size

Out of Stock

CAS No.

: 610261-08-0;29969-25-3(HClsalt)

Mol F.

: C11H13NO2

Mol W.

: 191.23

Cat No.

: SA19309

Impurities, Rosuvastatin

5’-O-tert-Butyldimethylsilyl Rosuvastatin Lactone

Please enquire for price & pack size

Out of Stock

CAS No.

: 1246832-82-5

Mol F.

: C28H40FN3O5SSi

Mol W.

: 577.78

Cat No.

: SA12133

Dutasteride, Impurities

5(10) dehydro 17-carboxamide Dutasteride

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C18H24N2O2

Mol W.

: 300.39

Cat No.

: SA35212

Dutasteride, Impurities

5(10) dehydro Dutasteride

Please enquire for price & pack size

Out of Stock

CAS No.

: 1365545-48-7

Mol F.

: C26H26F6N2O2

Mol W.

: 512.49

Cat No.

: SA35211

Azacitidine, Impurities

5′-Uridylic Acid

Please enquire for price & pack size

Out of Stock

CAS No.

: 58-97-9

Mol F.

: C9H13N2O9P

Mol W.

: 324.18

Cat No.

: SA37507

Carbamazepine, Impurities

5H-Dibenz[b,f]azepin-2-ol

Please enquire for price & pack size

Out of Stock

CAS No.

: 81861-18-9

Mol F.

: C14H11NO

Mol W.

: 209.24

Cat No.

: SA20337

Exemestane, Impurities

5β-Androstan-3α,6β-diol-17-one

Please enquire for price & pack size

Out of Stock

CAS No.

: 14895-71-7

Mol F.

: C19H30O3

Mol W.

: 306.44

Cat No.

: SA19136

Bupropion, Impurities

6-(3-Chlorophenyl)-6-hydroxy-5-methyl-3-thiomorpholine Carboxylic Acid (Mixture of Diastereomers)

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C12H12ClNO4S

Mol W.

: 301.75

Cat No.

: SA12219

Impurities, Riociguat

6-Amino-2-(1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)-7,9-dimethyl-7,9-dihydro-8H-purin-8-one

Please enquire for price & pack size

Out of Stock

CAS No.

: 1361569-23-4

Mol F.

: C20H17FN8O

Mol W.

: 404.4

Cat No.

: SA50822

Impurities, Vericiguat

6-Amino-2-(5-fluoro-1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)-7,9-dihydro-8H-purin-8-one

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C18H12F2N8O

Mol W.

: 394.3

Cat No.

: SA50711

Impurities, Riociguat

6-Amino-2-[1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl]-7,9-dihydro-8H-purin-8-one

Please enquire for price & pack size

Out of Stock

CAS No.

: 1361569-10-9

Mol F.

: C18H13FN8O

Mol W.

: 376.4

Cat No.

: SA50820

Aminocaproic Acid, Impurities

6-Aminocaproic Acid Benzyl Ester

Please enquire for price & pack size

Out of Stock

CAS No.

: 5515-01-5(base);5515-00-4(HCl)

Mol F.

: C₁₃H₁₉NO₂

Mol W.

: 221.3

Cat No.

: SA22606

Impurities, Ketorolac

6-Benzoyl 1-Acetyloxy Methyl Ester Ketorolac

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C18H17NO5

Mol W.

: 327.33

Cat No.

: SA36119

Impurities, Ketorolac

6-Benzoyl Ethyl Ester Ketorolac Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 2514847-58-4

Mol F.

: C17H17NO3

Mol W.

: 283.32

Cat No.

: SA36118

Ciprofloxacin, Impurities

6-Benzyloxy Benzyl Ester Ciprofloxacin

Please enquire for price & pack size

Out of Stock

CAS No.

: 1391053-23-8

Mol F.

: C27H22FNO4

Mol W.

: 443.47

Cat No.

: SA42010

Hydrocortisone, Impurities

6-beta-Hydroxycortisol Sulfate

Please enquire for price & pack size

Out of Stock

CAS No.

: 53587-06-7

Mol F.

: C₂₁H₃₀O₉S

Mol W.

: 458.52

Cat No.

: SA15215

Impurities, Palbociclib

6-Bromo-8-cyclopentyl-5-methyl-Pyrido[2,3-d]pyrimidine-2,7(1H,8H)-dione

Please enquire for price & pack size

Out of Stock

CAS No.

: 1922954-32-2

Mol F.

: C13H14BrN3O

Mol W.

: 324.17

Cat No.

: SA40429

Aciclovir, Impurities

6-Chloro Aciclovir Acetate

Please enquire for price & pack size

Out of Stock

CAS No.

: 81777-48-2

Mol F.

: C10H12ClH5O3

Mol W.

: 285.69

Cat No.

: SA21425

Diflorasone Acetate, Impurities

6-chloro halobetasol propionate

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C25H31Cl2FO5

Mol W.

: 501.4

Cat No.

: SA44409

Impurities, Uracil

6-Chloro-1,3-dimethyluracil

Please enquire for price & pack size

Out of Stock

CAS No.

: 6972-27-6

Mol F.

: C6H7ClN2O2

Mol W.

: 174.58

Cat No.

: SA45304

Impurities, Uracil

6-Chlorouracil

Please enquire for price & pack size

Out of Stock

CAS No.

: 4270-27-3

Mol F.

: C4H3ClN2O2

Mol W.

: 146.53

Cat No.

: SA45303

Impurities, Norethindrone

6-Dehydro-6-acetoxy Norethindrone Acetate

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C24H28O5

Mol W.

: 396.48

Cat No.

: SA13429

Impurities, Penciclovir

6-Deoxypenciclovir Impurity

$195.00 25 mg

Out of Stock

CAS No.

: 104227-86-3 (Base); 246021-75-0 (HCl)

Mol F.

: C10H15N5O2

Mol W.

: 237.26

Cat No.

: SA27708

Impurities, Palbociclib

6-Desacetyl-6-bromo-N-Boc Palbociclib

Please enquire for price & pack size

Out of Stock

CAS No.

: 571188-82-4

Mol F.

: C‚‡Hƒ„BrN‡Oƒ

Mol W.

: 584.51

Cat No.

: SA40410

Impurities, Palbociclib

6-Desacetyl-N-Boc Palbociclib Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 571189-65-6

Mol F.

: C‚‡Hƒ…N‡Oƒ

Mol W.

: 505.61

Cat No.

: SA40415

Etravirine, Impurities

6-Desamino 5-Desbromo 6-Chloro Etravirin

Please enquire for price & pack size

Out of Stock

CAS No.

: 1070377-34-2

Mol F.

: C20H14ClN5O

Mol W.

: 375.81

Cat No.

: SA26105

Empagliflozin, Impurities

6-DiTHF Empagliflozin impurity

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C27H33ClO8

Mol W.

: 521

Cat No.

: SA15132

Impurities, Risperidone

6-fluoro-3-(1-nitrosopiperidin-4-yl)benzo[d]isoxazole

Please enquire for price & pack size

Out of Stock

CAS No.

: 2416230-38-9

Mol F.

: C12H12FN3O2

Mol W.

: 249.24

Cat No.

: SA26323

Halcinonide, Impurities

6-Hydroxy 11-keto Halcinonide

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C24H30ClFO6

Mol W.

: 468.94

Cat No.

: SA30408

Exemestane, Impurities

6-Hydroxy-6-(methoxymethyl)-androsta-1,4-diene-3,17-dione

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C21H28O4

Mol W.

: 344.44

Cat No.

: SA19108

Impurities, Pregabalin

6-Hydroxy-pregabalin Hydrochloride Diastereomer Mixture

Please enquire for price & pack size

Out of Stock

CAS No.

: 1824424-61-4(freebase)

Mol F.

: C8H17NO3.HCl

Mol W.

: 211.68

Cat No.

: SA24814

Impurities, Niacin

6-Hydroxynicotinic acid

Please enquire for price & pack size

Out of Stock

CAS No.

: 5006-66-6

Mol F.

: C6H5NO3

Mol W.

: 139.11000000000001

Cat No.

: SA33101

Estradiol, Impurities

6-Keto 17β-Estradiol

Please enquire for price & pack size

Out of Stock

CAS No.

: 571-92-6

Mol F.

: C₁₈H₂₂O₃

Mol W.

: 286.37

Cat No.

: SA13205

Estrone, Impurities

6-Keto estrone

Please enquire for price & pack size

Out of Stock

CAS No.

: 1476-34-2

Mol F.

: C18H20O3

Mol W.

: C18H20O3

Cat No.

: SA16009

Halcinonide, Impurities

6-Keto Halcinonide

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C24H30ClFO6

Mol W.

: 468.94

Cat No.

: SA30406

Impurities, Testosterone

6-Keto Testosterone Cypionate

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C27H38O4

Mol W.

: 426.6

Cat No.

: SA16219

Ethinylestradiol, Impurities

6-Keto-18-methyl-17-Ethinylestradiol

Please enquire for price & pack size

Out of Stock

CAS No.

: 38165-80-9

Mol F.

: C21H24O3

Mol W.

: 324.42

Cat No.

: SA13110

Impurities, Nandrolone

6-Ketonandrolone

Please enquire for price & pack size

Out of Stock

CAS No.

: 1175130-27-4

Mol F.

: C18H24O3

Mol W.

: C18H24O3

Cat No.

: SA16303

Azathioprine, Impurities

6-Mercaptopurine Disulfide

Please enquire for price & pack size

Out of Stock

CAS No.

: 49808-20-0

Mol F.

: C₁₀H₆N₈S₂

Mol W.

: 302.34

Cat No.

: SA17901

Impurities, Isoquinoline

6-methoxy-3,4-dihydroisoquinoline

Please enquire for price & pack size

Out of Stock

CAS No.

: 14446-29-8;93549-15-6(HClsalt)

Mol F.

: C10H11NO

Mol W.

: 161.19999999999999

Cat No.

: SA19302

Impurities, Raltegravir

6-methoxypyrimidin Raltegravir Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 1370588-48-9

Mol F.

: C20H21FN6O5

Mol W.

: 444.42

Cat No.

: SA25610

Dorzolamide, Impurities

6-Methyl-4-oxo-5,6-dihydro-4H-thieno[2,3-b]thiopyran-2-sulfonamide

$155.00 25 mg

Out of Stock

CAS No.

: 120279-88-1

Mol F.

: C8H9NO3S3

Mol W.

: 263.36

Cat No.

: SA24113

Impurities, Niacin

6-Methylnicotinic acid

Please enquire for price & pack size

Out of Stock

CAS No.

: 3222-47-7

Mol F.

: C7H7NO2

Mol W.

: 137.13999999999999

Cat No.

: SA33103

Impurities, Uracil

6-METHYLURACIL

Please enquire for price & pack size

Out of Stock

CAS No.

: 626-48-2

Mol F.

: C5H6N2O2

Mol W.

: 126.11

Cat No.

: SA45305

Cabergoline, Impurities

6-Norcabergoline Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 153415-36-2

Mol F.

: C23H33N5O2

Mol W.

: 411.54

Cat No.

: SA51802

Donepezil, Impurities

6-O-Desmethyl Donepezil Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 120013-56-1

Mol F.

: C23H27NO3

Mol W.

: 365.47

Cat No.

: SA34304

Erlotinib, Impurities

6-O-Desmethyl Erlotinib

Please enquire for price & pack size

Out of Stock

CAS No.

: 183321-86-0(base)183320-51-6(HClsalt)

Mol F.

: C21H21N3O4

Mol W.

: 379.41

Cat No.

: SA25203