Home / Products / Impurities

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.

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

Impurities, Losartan

[1,1’-Biphenyl]-2’-tetrazolo-4-carboxylic acid, [1,1’-biphenyl]-2’-tetrazolo-4-ylmethyl ester

$395.00 25 mg

Out of Stock

CAS No.

: 1159977-10-2

Mol F.

: C28H20N8O2

Mol W.

: 500.51

Cat No.

: SA26723

Empagliflozin, Impurities

[2-chloro-5-(tetrahydrofuran-3-yloxy)phenyl][4-(tetrahydrofuran-3-yloxy)phenyl]methanone

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C21H21ClO5

Mol W.

: 388.84

Cat No.

: SA15148

Impurities, Testosterone

∆ 8(9) Testosterone Cypionate

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C27H38O3

Mol W.

: 410.6

Cat No.

: SA16223

Impurities, Testosterone

∆ 9(11) Testosterone Cypionate

Please enquire for price & pack size

Out of Stock

CAS No.

: 122651-11-0

Mol F.

: C27H38O3

Mol W.

: 410.6

Cat No.

: SA16222

Impurities, Norethindrone

∆-5(6)-Norethindrone Acetate; Norethindrone Acetate EP Impurity C

Please enquire for price & pack size

Out of Stock

CAS No.

: 1175129-26-6

Mol F.

: C22H28O3

Mol W.

: 340.46

Cat No.

: SA13406

Impurities, Testosterone

∆8(14)-Testosterone

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C19H26O2

Mol W.

: 286.41

Cat No.

: SA16226

Impurities, Ritlecitinib

1-((2S,5R)-5-(7H-pyrrolo[2,3-d]pyrimidin-4-ylamino)-2-methylpiperidin-1-yl)-3-chloropropan-1-one

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C15H20ClN5O

Mol W.

: 321.81

Cat No.

: SA50006

Hydrocortisone, Impurities

1-((8S,9S,10R,11S,13S,14S,17R)-11,17-dihydroxy-10,13-dimethyl-3-oxo-2,3,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl)-2,3-dihydroxy-4-((8S,9S,10R,11S,13S,14S,17S)-11-hydroxy-10,13-dimethyl-3-oxo-2,3,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl)butane-1,4-dione

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C42H58O9

Mol W.

: 706.92

Cat No.

: SA15231

Impurities, Timolol

1-(2-(tert-Butylamino)-2-hydroxyethyl)-4-morpholino-1H-imidazol-5(2H)-one

Please enquire for price & pack size

Out of Stock

CAS No.

: 158636-97-6

Mol F.

: C13H24N4O3

Mol W.

: 284.35000000000002

Cat No.

: SA23221

Impurities, Tulobuterol

1-(2-Chlorophenyl)-2-Bromoethanol

Please enquire for price & pack size

Out of Stock

CAS No.

: 72702-57-9

Mol F.

: C8H8BrClO

Mol W.

: 235.5

Cat No.

: SA19603

Impurities, Palbociclib

1-(2-Nitropyridin-3-yl)piperazine

Please enquire for price & pack size

Out of Stock

CAS No.

: 1566082-34-5

Mol F.

: C9H12N4O2

Mol W.

: 208.22

Cat No.

: SA40432

Dolutegravir, Impurities

1-(2,2-Dimethoxyethyl)-1,4-dihydro-4-oxo-2,5-pyridinedicarboxylic Acid 2,5-Diethyl Ester

Please enquire for price & pack size

Out of Stock

CAS No.

: 1246616-75-0

Mol F.

: C15H21NO7

Mol W.

: 327.33

Cat No.

: SA20222

Dolutegravir, Impurities

1-(2,3-Dihydroxypropyl)-4-oxo-3-[(phenylmethyl)oxy]-1,4-dihydro-2-pyridinecarboxylic Acid

Please enquire for price & pack size

Out of Stock

CAS No.

: 1206102-06-8

Mol F.

: C16H17NO6

Mol W.

: 319.31

Cat No.

: SA20221

Dolutegravir, Impurities

1-(2,3-Dihydroxypropyl)-4-oxo-3-[(phenylmethyl)oxy]-1,4-dihydro-2-pyridinecarboxylic Acid Methyl Ester

Please enquire for price & pack size

Out of Stock

CAS No.

: 1206102-07-9

Mol F.

: C17H19NO6

Mol W.

: 333.34

Cat No.

: SA20220

Erlotinib, Impurities

1-(3-(6,7-bis(2- methoxyethoxy)quinazolin-4- ylamino)phenyl)ethanone

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C22H25N3O5

Mol W.

: 411.45

Cat No.

: SA25225

Bupropion, Impurities

1-(3-Chlorophenyl)-1,2-propanedione 2-Oxime

Please enquire for price & pack size

Out of Stock

CAS No.

: 56472-71-0

Mol F.

: C9H8ClNO2

Mol W.

: 197.62

Cat No.

: SA12210

Gabapentin, Impurities

1-(3-Oxo-2-aza-spiro[4,5]dec-2-ylmethyl)cyclohexaneethanol

Please enquire for price & pack size

Out of Stock

CAS No.

: 1797133-25-5

Mol F.

: C₁₈H₃₁NO₂

Mol W.

: 293.44

Cat No.

: SA22815

Gabapentin, Impurities

1-(3-Oxo-2-aza-spiro[4,5]dec-2-ylmethyl)cyclohexaneethanol Benzyl Ether

Please enquire for price & pack size

Out of Stock

CAS No.

: 1797131-29-3

Mol F.

: C₂₅H₃₇NO₂

Mol W.

: 383.57

Cat No.

: SA22816

Impurities, Riociguat

1-(4-Fluorobenzyl)-1H-pyrazolo[3,4-b]pyridine-3-carboximidamide hydrochloride

Please enquire for price & pack size

Out of Stock

CAS No.

: 2512205-26-2

Mol F.

: C14H13ClFN5

Mol W.

: 305.8

Cat No.

: SA50819

Apixaban, Impurities

1-(4-Iodophenyl)-3-morpholino-5,6-dihydropyridin-2(1H)-one

Please enquire for price & pack size

In Stock

CAS No.

: 473927-69-4

Mol F.

: C15H17IN2O2

Mol W.

: 384.21

Cat No.

: SA39967

Apixaban, Impurities

1-(4-Methoxyphenyl)-4-(2-(4-(2-oxopiperidin-1-yl)phenylamino)ethyl)-1H-pyrazole-3,5-dicarboxylic acid

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C25H26N4O6

Mol W.

: 478.5

Cat No.

: SA39963

Apixaban, Impurities

1-(4-Nitrophenyl)piperidin-2-one

Please enquire for price & pack size

Out of Stock

CAS No.

: 38560-30-4

Mol F.

: C11H12N2O3

Mol W.

: 220.22

Cat No.

: SA39925

Azacitidine, Impurities

1-(5-O-Acetyl-β-D-ribofuranosyl)-4-amino-1,3,5-triazin-2(1H)-one

Please enquire for price & pack size

Out of Stock

CAS No.

: 1174733-90-4

Mol F.

: C10H14N4O6

Mol W.

: 286.24

Cat No.

: SA37506

Impurities, Ribociclib

1-(6-((7-cyclopentyl-6-(dimethylcarbamoyl)-7H-pyrrolo[2,3-d]pyrimidin-2-yl)amino)pyridin-3-yl)piperazine 1-oxide

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C23H30N8O2

Mol W.

: 450.54

Cat No.

: SA47120

Impurities, Palbociclib

1-(6-Nitro-3-pyridinyl)piperazine

Please enquire for price & pack size

Out of Stock

CAS No.

: 775288-71-6

Mol F.

: C9H12N4O2

Mol W.

: 208.22

Cat No.

: SA40407

Brexpiprazole, Impurities

1-(benzo[b]thiophen-4-yl)piperazine sulfate

Please enquire for price & pack size

Out of Stock

CAS No.

: 846038-18-4

Mol F.

: C12H16N2O4S2

Mol W.

: 316.4

Cat No.

: SA41324

Clotrimazole, Impurities

1-(Methoxymethyl)-1H-imidazole

Please enquire for price & pack size

Out of Stock

CAS No.

: 20075-26-7

Mol F.

: C5H8N2O

Mol W.

: 112.13

Cat No.

: SA11609

Dapagliflozin, Impurities

1-(R,S)-O-ethoxyphenyl Dapagliflozin

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C21H25ClO6

Mol W.

: 408.88

Cat No.

: SA15001

Brexpiprazole, Impurities

1-(tert-Butoxycarbonyl)piperazine

Please enquire for price & pack size

Out of Stock

CAS No.

: 57260-71-6

Mol F.

: C9H18N2O2

Mol W.

: 186.26

Cat No.

: SA41331

Impurities, Venlafaxine

1-[(4-Benzyloxyphenyl)-(dimethylcarbamoyl)methyl]cyclohexanol

Please enquire for price & pack size

Out of Stock

CAS No.

: 955365-79-4

Mol F.

: C23H29NO3

Mol W.

: 367.48

Cat No.

: SA22730

Impurities, Palbociclib

1-[2-Chloro-4-(cyclopentylamino)-5-pyrimidinyl]ethanone Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 1244949-62-9

Mol F.

: CH„ClNƒO

Mol W.

: 239.7

Cat No.

: SA40416

Impurities, Propranolol

1-[2-Hydroxy-3-(1-naphthalenyloxy)propyl]-2,5-pyrrolidinedione

Please enquire for price & pack size

Out of Stock

CAS No.

: 345931-85-3

Mol F.

: C17H17NO4

Mol W.

: 299.32

Cat No.

: SA24610

Cinnarizine, Impurities

1-[4-(Diphenylmethyl)-1-piperazinyl]-3,3-diphenyl-1-propanone

Please enquire for price & pack size

Out of Stock

CAS No.

: 41332-24-5

Mol F.

: C₃₂H₃₂N₂O

Mol W.

: 460.61

Cat No.

: SA12407

Empagliflozin, Impurities

1-Alpha 3-Epi Tetraacetate Empagliflozin

Please enquire for price & pack size

Out of Stock

CAS No.

: 1620758-27-1

Mol F.

: C31H35ClO11

Mol W.

: 619.06

Cat No.

: SA15145

Impurities, Irbesartan

1-Amino-1-cyanocyclopentane Hydrochloride

Please enquire for price & pack size

Out of Stock

CAS No.

: 16195-83-8

Mol F.

: C6H11ClN2

Mol W.

: 146.62

Cat No.

: SA23313

Brexpiprazole, Impurities

1-benzo[b]thiophen-4 -yl – piperazine

Please enquire for price & pack size

Out of Stock

CAS No.

: 846038-18-4 (free amine); 913614-18-3 (HCl Salt)

Mol F.

: C12H14N2S

Mol W.

: 254.78

Cat No.

: SA41316

Impurities, Terbinafine

1-Bromo-6,6-dimethyl-2-hepten-4-yne

Please enquire for price & pack size

Out of Stock

CAS No.

: 126764-15-6

Mol F.

: C9H13Br

Mol W.

: 201.1

Cat No.

: SA25712

Impurities, Terbinafine

1-Bromopropyn-3-ol

Please enquire for price & pack size

Out of Stock

CAS No.

: 2060-25-5

Mol F.

: C3H3BrO

Mol W.

: 134.96

Cat No.

: SA25713

Canagliflozin, Impurities

1-C-[3-[[5-(4-Fluorophenyl)-2-thienyl]methyl]-4-methylphenyl]-D-glucose

Please enquire for price & pack size

Out of Stock

CAS No.

: 1809403-04-0

Mol F.

: C24H25FO6S

Mol W.

: 460.5

Cat No.

: SA14926

Dutasteride, Impurities

1-Chloro Dutasteride; Dutasteride EP Impurity F

Please enquire for price & pack size

Out of Stock

CAS No.

: 1365545-42-1

Mol F.

: C27H31ClF6N2O2

Mol W.

: 564.99

Cat No.

: SA35206

Impurities, Ranolazine

1-Chloro-3-(2-methoxyphenoxy)propan-2-ol

Please enquire for price & pack size

Out of Stock

CAS No.

: 25772-81-0

Mol F.

: C10H13ClO3

Mol W.

: 216.66

Cat No.

: SA26813

Impurities, Terbinafine

1-Chloro-6,6-dimethyl-2-heptene-4-yne (90:10 E:Z)

Please enquire for price & pack size

Out of Stock

CAS No.

: 126764-17-8

Mol F.

: C9H13Cl

Mol W.

: 156.65

Cat No.

: SA25715

Citalopram, Impurities

1-Descyano 1-(4-Dimethylamino)oxobutyl Citadiol

Please enquire for price & pack size

Out of Stock

CAS No.

: 1433278-32-0

Mol F.

: C25H35FN2O3

Mol W.

: 430.56

Cat No.

: SA17023

Dapagliflozin, Impurities

1-Hydroxy Dapagliflozin Impurity

$190.00 25 mg

Out of Stock

CAS No.

: 461432-27-9

Mol F.

: C21H25ClO7

Mol W.

: 424.88

Cat No.

: SA15013

Ertugliflozin, Impurities

1-Hydroxy Ertugliflozin Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C22H27ClO8

Mol W.

: 454.9

Cat No.

: SA36810

Impurities, Ketorolac

1-Hydroxy Ketorolac; Ketorolac EP Impurity A

Please enquire for price & pack size

Out of Stock

CAS No.

: 154476-25-2

Mol F.

: C14H13NO2

Mol W.

: 227.26

Cat No.

: SA36101

Fingolimod, Impurities

1-Hydroxy Nitro Fingolimod Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 899822-99-2

Mol F.

: C19H31NO5

Mol W.

: 353.45

Cat No.

: SA34501

Impurities, Ketorolac

1-Imino Ketorolac Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C14H12N2O

Mol W.

: 224.26

Cat No.

: SA36114

Impurities, Leflunomide

1-Isocyanato-4-(trifluoromethyl)benzene

Please enquire for price & pack size

Out of Stock

CAS No.

: 1548-13-6

Mol F.

: C8H4F3NO

Mol W.

: 187.12

Cat No.

: SA21818

Halcinonide, Impurities

1-Keto Halcinonide

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C24H30ClFO6

Mol W.

: 468.94

Cat No.

: SA30407