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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, Rosuvastatin

Rosuvastatin EP Impurity F Z-isomer

$250.00 25 mg

Limited Stock

CAS No.

: 1821422-50-7

Mol F.

: C29H40FN3O6S

Mol W.

: 577.71

Cat No.

: SA121116

Fulvestrant, Impurities

S-Deoxo-3,17-bis-(O-tetrahydro-2H-pyran-2-yl)-6-hydroxy-fulvestrant

Please enquire for price & pack size

Limited Stock

CAS No.

Mol F.

: C42H63F5O5S

Mol W.

: 775

Cat No.

: SA11807

Impurities, Saxagliptin

Saxagliptin Imine Impurity

Please enquire for price & pack size

Limited Stock

CAS No.

: 1350800-76-8

Mol F.

: C18H25N3O2

Mol W.

: 315.41

Cat No.

: SA27405

Impurities, Saxagliptin

Saxagliptin N-Acetate Impurity

Please enquire for price & pack size

Limited Stock

CAS No.

: NA

Mol F.

: C20H27N3O3

Mol W.

: 357.45

Cat No.

: SA27406

Impurities, Sulpiride

Sulpiride EP impurity B

Please enquire for price & pack size

Limited Stock

CAS No.

: 33045-52-2

Mol F.

: C9H11NO5S

Mol W.

: 245.26

Cat No.

: SA10902

Impurities, Telmisartan

Telmisartan Bromo Amide

Please enquire for price & pack size

Limited Stock

CAS No.

: 147404-72-6

Mol F.

: C14H12BrNO

Mol W.

: 289.01

Cat No.

: SA33910

Impurities, Tenofovir

Tenofovir Disoproxil Fumarate IP Impurity D

$295.00 25 mg

Limited Stock

CAS No.

: 1422284-15-8

Mol F.

: C21H32N5O11P

Mol W.

: 561.48

Cat No.

: SA36904

Impurities, Testosterone

Testosterone EP Impurity B

Please enquire for price & pack size

Limited Stock

CAS No.

: 972-46-3

Mol F.

: C21H30O2

Mol W.

: 314.5

Cat No.

: SA16204

Impurities, Testosterone

Testosterone EP Impurity J

Please enquire for price & pack size

Limited Stock

CAS No.

: 57144-06-6

Mol F.

: C20H28O2

Mol W.

: 300.44

Cat No.

: SA16212

Impurities, Tofacitinib

Tofacitinib N-Oxide

$280.00 25 mg

Limited Stock

CAS No.

: 2028267-73-2

Mol F.

: C16H20N6O2

Mol W.

: 328.37

Cat No.

: SA43304

Impurities, Triamcinolone Acetonide

Triamcinolone Acetonide EP Impurity B

$495.00 25 mg

Limited Stock

CAS No.

: 1260149-96-9

Mol F.

: C24H29FO6

Mol W.

: 432.48

Cat No.

: SA30202

Impurities, Trimethoprim

Trimethoprim EP Impurity C

$175.00 25 mg

Limited Stock

CAS No.

: 29606-06-2

Mol F.

: C14H18N4O4

Mol W.

: 306.32

Cat No.

: SA27103

Impurities, Indacaterol

Unknown impurity RRT 1.11

Please enquire for price & pack size

Limited Stock

CAS No.

: NA

Mol F.

: C18H13Br2NO3

Mol W.

: 451.11

Cat No.

: SA48712

Cinacalcet, Impurities

USP Cinacalcet Related Compound D

Please enquire for price & pack size

Limited Stock

CAS No.

: 694495-47-1

Mol F.

: C22H23ClF3N

Mol W.

: 393.87

Cat No.

: SA34206

Impurities, Venlafaxine

Venlafaxine EP Impurity B

$155.00 25 mg

Limited Stock

CAS No.

: 323176-93-8

Mol F.

: C14H22ClNO3

Mol W.

: 287.78

Cat No.

: SA22701

Gemcitabine, Impurities

((2R,3R)-3-(benzoyloxy)-4,4-difluoro-5-oxotetrahydrofuran-2-yl)methyl benzoate impurity

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C19H14F2O6

Mol W.

: 376.31

Cat No.

: SA44523

Canagliflozin, Impurities

((2R,3S,4R,5R,6R)-6-(3-((5-(4-fluorophenyl)thiophen-2-yl)methyl)-4-methylphenyl)-3,4,5-trihydroxytetrahydro-2H-pyran-2-yl)methyl propionate

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C27H29FO6S

Mol W.

: 500.58

Cat No.

: SA14935

Impurities, Remdesivir

((2R,3S,4R,5R)-5-(4-aminopyrrolo[1,2-f][1,2,4]triazin-7-yl)-5-cyano-3,4-dihydroxytetrahydrofuran-2-yl)methyl dihydrogen phosphate

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C12H14N5O7P

Mol W.

: 371.06

Cat No.

: SA42735

Impurities, Molnupiravir

((3aR,4R,6R,6aR)-2,2-Dimethyl-6-(2-oxo-4-(1H-1,2,4-triazol-1-yl)pyrimidin-1(2H)-yl)-tetrahydrofuro[3,4-d][1,3]dioxol-4-yl)methyl isobutyrate

Please enquire for price & pack size

Out of Stock

CAS No.

: 2346620-54-8

Mol F.

: C18H23N5O6

Mol W.

: 405.41

Cat No.

: SA46203

Impurities, Molnupiravir

((3aR,4R,6R,6aR)-6-(2,4-Dioxo-3,4-dihydropyrimidin-1(2H)-yl)-2,2-dimethyl-tetrahydrofuro[3,4-d][1,3]dioxol-4-yl)methyl isobutyrate

Please enquire for price & pack size

Out of Stock

CAS No.

: 2346620-53-7

Mol F.

: C16H22N2O7

Mol W.

: 354.36

Cat No.

: SA46204

Impurities, Topiramate

((3aR,6S,7S,7aR)-6,7-Dihydroxy-2,2-dimethyltetrahydro-3aH-[1,3]dioxolo[4,5-b]pyran-3a-yl)methyl Sulfamate

Please enquire for price & pack size

Out of Stock

CAS No.

: 152192-21-7

Mol F.

: C9H17NO8S

Mol W.

: 299.3

Cat No.

: SA45512

Impurities, Rosuvastatin

(+/-)-tert-Butyl 6-Chloro-5-hydroxy-3-oxohexanoate

Please enquire for price & pack size

Out of Stock

CAS No.

: 319924-73-7

Mol F.

: C10H17ClO4

Mol W.

: 236.69

Cat No.

: SA12154

Ethinylestradiol, Impurities

(±)-6-Hydroxy Ethinylestradiol

Please enquire for price & pack size

Out of Stock

CAS No.

: 108646-70-4

Mol F.

: C20H24O3

Mol W.

: 312.41

Cat No.

: SA13115

Fosaprepitant, Impurities

(1’S,2S,3R)-Fosaprepitant Dimeglumine

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C37H56F7N6O16P

Mol W.

: 1004.83

Cat No.

: SA45417

Ethinylestradiol, Impurities

(13S,14R, 17R)-Ethinyl Estradiol

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C20H20O2

Mol W.

: 292.37

Cat No.

: SA13131

Impurities, Mometasone

(16α)-21-Chloro-17-hydroxy-16-methylpregna-1,4,9(11)-triene-3,20-dione

$595.00 25 mg

Out of Stock

CAS No.

: 151265-36-0

Mol F.

: C22H27ClO3

Mol W.

: 374.9

Cat No.

: SA28715

Impurities, Norethindrone

(17α)-17-Hydroxy-19-norpregn-5-en-20-yn-3-one Cyclic 1,2-Ethanediyl Acetal

Please enquire for price & pack size

Out of Stock

CAS No.

: 22170-58-7

Mol F.

: C22H30O3

Mol W.

: 342.47

Cat No.

: SA13435

Estradiol, Impurities

(17β)-3,17-Bis[(1-oxopentyl)oxy]-estra-1,3,5(10)-trien-6-one

Please enquire for price & pack size

Out of Stock

CAS No.

: 1350468-78-8

Mol F.

: C₂₈H₃₈O₅

Mol W.

: 454.6

Cat No.

: SA13208

Estradiol, Impurities

(17β)-3,17-Bis[(tetrahydro-2H-pyran-2-yl)oxy]-estra-1,3,5(10)-trien-6-one

Please enquire for price & pack size

Out of Stock

CAS No.

: 53573-82-3

Mol F.

: C₂₈H₃₈O₅

Mol W.

: 454.6

Cat No.

: SA13207

Impurities, Levomilnacipran

(1R-cis)-Milnacipran

Please enquire for price & pack size

Out of Stock

CAS No.

: 175131-61-0

Mol F.

: C₁₅H₂₃ClN₂O

Mol W.

: 282.81

Cat No.

: SA29203

Impurities, Tadalafil

(1R, 3R) N-Methyl Amide Tadalafil Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C20H19N3O3

Mol W.

: 349.38

Cat No.

: SA20910

Edoxaban, Impurities

(1R,2R,4S)-2-((tert-Butoxycarbonyl)amino)-4-(dimethylcarbamoyl)cyclohexyl Methanesulfonate

Please enquire for price & pack size

Out of Stock

CAS No.

: 929693-31-2

Mol F.

: C15H28N2O6S

Mol W.

: 364.46

Cat No.

: SA33037

Impurities, Tramadol

(1R,2R)-Tramadol EP Impurity D (HCl)

Please enquire for price & pack size

Out of Stock

CAS No.

: 148262-77-5

Mol F.

: C15H23NO2. HCl

Mol W.

: 249.36 : 36.46

Cat No.

: SA49707

Impurities, Nirmatrelvir

(1R,2S,5S)-N-((2S)-1-Amino-1-oxo-3-(2-oxopyrrolidin-3-yl)propan-2-yl)-3-((S)-3,3-dimethyl-2-(2,2,2-trifluoroacetamido)butanoyl)-6,6-dimethy

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C23H34F3N5O5

Mol W.

: 517.6

Cat No.

: SA46913

Impurities, Sapropterin

(1R,2S)-1-(2-amino-4-oxo-3,4-dihydropteridin-6-yl)-2-hydroxypropyl acetate

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C11H13N5O4

Mol W.

: 279.26

Cat No.

: SA45212

Impurities, Ticagrelor

(1R,2S)-2-(3,4-Difluorophenyl)cyclopropanamine Hydrochloride

Please enquire for price & pack size

Out of Stock

CAS No.

: 1402222-66-5

Mol F.

: C9H9F2N

Mol W.

: 205.63

Cat No.

: SA32518

Impurities, Nirmatrelvir

(1S,2R,5R)-N-((S)-1-Cyano-2-((S)-2-oxopyrrolidin-3-yl)ethyl)-3-((S)-3,3-dimethyl-2-(2,2,2-trifluoroacetamido)butanoyl)-6,6-dimethyl-3-azabi

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C23H32F3N5O4

Mol W.

: 499.5

Cat No.

: SA46904

Impurities, Tramadol

(1S,2S)-Tramadol EP Impurity D (HCl)

Please enquire for price & pack size

Out of Stock

CAS No.

: 148218-19-3

Mol F.

: C15H23NO2. HCl

Mol W.

: 249.36 : 36.46

Cat No.

: SA49704

Impurities, Saxagliptin

(1S,3S,5S)-2-azabicyclo[3.1.0]hexane-3-carbonitrile

Please enquire for price & pack size

Out of Stock

CAS No.

: 866083-42-3

Mol F.

: C6H8N2

Mol W.

: 108.14

Cat No.

: SA27419

Abacavir, Impurities

(1S,4R)-4-(2-Amino-6-chloro-9H-purin-9-yl)-2-cyclopentene-1-carboxylate

Please enquire for price & pack size

Out of Stock

CAS No.

: 1246819-78-2

Mol F.

: C11H10ClN5O2

Mol W.

: 279.68

Cat No.

: SA18115

Abacavir, Impurities

(1S,4R)-4-Amino-2-cyclopentene-1-methanol

Please enquire for price & pack size

Out of Stock

CAS No.

: 136522-35-5

Mol F.

: C6H11NO

Mol W.

: 113.16

Cat No.

: SA18118

Impurities, Ribociclib

(2-Chloro-7-cyclopentyl-7H-pyrrolo[2,3-d]pyrimidin-6-yl)methanol

Please enquire for price & pack size

Out of Stock

CAS No.

: 1374639-77-6

Mol F.

: C12H14ClN3O

Mol W.

: 251.71

Cat No.

: SA47124

Apremilast, Impurities

(2’S)-2′-[(1S)-1-(3-Ethoxy-4-methoxyphenyl)-2-(methylsulfonyl)ethyl]-4-acetylamino-2,4′-biisoindole-1,1′,3,3′-tetrone

$295.00 25 mg

Out of Stock

CAS No.

Mol F.

: C30H27N3O9S

Mol W.

: 605.62

Cat No.

: SA30012

Impurities, Rosuvastatin

(2E,5R,6E)-3-Dehydroxy Rosuvastatin

$1,250.00 25 mg

Out of Stock

CAS No.

Mol F.

: C22H26FN3O5S

Mol W.

: 463.52

Cat No.

: SA12135

Impurities, Nebivolol

(2R, 2’S)-6-Fluoro-2-(2′-oxiranyl)chromane

Please enquire for price & pack size

Out of Stock

CAS No.

: 129050-26-6

Mol F.

: C11H11FO2

Mol W.

: 194.2

Cat No.

: SA14702

Canagliflozin, Impurities

(2R,3R,4R,5S,6S)-2-(acetoxymethyl)-6-(3-((5-(4-fluorophenyl)thiophen-2-yl)methyl)-2-methylphenyl)tetrahydro-2H-pyran-3,4,5-triyl triacetate

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C32H33FO9S

Mol W.

: 612.66

Cat No.

: SA14930

Efinaconazole, Impurities

(2R,3S)-2-(2,4-Difluorophenyl)-1-(1H-1,2,4-triazol-1-yl)-2,3-butanediol

$695.00 25 mg

Out of Stock

CAS No.

: 135270-11-0

Mol F.

: C12H13F2N3O2

Mol W.

: 269.25

Cat No.

: SA23607

Argatroban, Impurities

(2R,4R)-1-[N8-amino-N2-(3-methylquinoline-8-sulfonyl)-L-arginyl]-4-methylpiperidine-2carboxylic acid

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C23H37N7O5S

Mol W.

: 523.65

Cat No.

: SA48407

Argatroban, Impurities

(2R,4R)-Benzyl 1-((S)-2-(tert-butoxycarbonyl)-5-(3-nitroguanidino)pentanoyl)-4-methylpiperidine-2-carboxylate

Please enquire for price & pack size

Out of Stock

CAS No.

: 367952-82-7

Mol F.

: C25H38N6O7

Mol W.

: 534.61

Cat No.

: SA48410

Argatroban, Impurities

(2R,4R)-Ethyl 1-((S)-5-guanidino-2-(6-hydroxy-3-methyl-1,2,3,4-tetrahydroquinoline-8-sulfonamido)pentanoyl)-4-methylpiperidine-2-carboxylat

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C25H40N6O6S

Mol W.

: 552.69000000000005

Cat No.

: SA48416