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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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Fluticasone Furoate, Impurities

11-Oxo-fluticasone Furoate Impurity

$350.00 25 mg

Out of Stock

CAS No.

: 397864-57-2

Mol F.

: C26H26F2O6S

Mol W.

: 504.54

Cat No.

: SA48210

Fluticasone Propionate, Impurities

11-Oxo-fluticasone Furoate Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 397864-57-2

Mol F.

: C26H26F2O6S

Mol W.

: 504.54

Cat No.

: SA47021

Impurities, Oxcarbazepine

11,11-Dichloro Oxcarbazepine

Please enquire for price & pack size

Out of Stock

CAS No.

: 1798004-39-3

Mol F.

: C15H10Cl2N2O2

Mol W.

: 32.16

Cat No.

: SA12515

Impurities, Methylprednisolone

11ß,17,20-Trihydroxy-6a-methyl-3-oxo-pregna-1,4-dien-21-yl acetate

$195.00 25 mg

Out of Stock

CAS No.

: 151003-82-6

Mol F.

: C24H34O6

Mol W.

: 418.52

Cat No.

: SA14421

Impurities, Progesterone

11α-Hydroxy Progesterone

Please enquire for price & pack size

Out of Stock

CAS No.

: 80-75-1

Mol F.

: C21H30O3

Mol W.

: 330.46

Cat No.

: SA18017

Impurities, Methylprednisolone Acetate

11β,17α-Dihydroxy-17β-formyl-6α-methylandrosta-1,4-diene-3-one

$395.00 25 mg

Out of Stock

CAS No.

Mol F.

: C21H28O4

Mol W.

: 344.44

Cat No.

: SA25008

Impurities, Progesterone

15β-Hydroxy Progesterone

Please enquire for price & pack size

Out of Stock

CAS No.

: 600-72-6

Mol F.

: C21H30O3

Mol W.

: 330.46

Cat No.

: SA18018

Impurities, Prednisone

16-Dehydro 17-Dehydroxy Prednisone

Please enquire for price & pack size

Out of Stock

CAS No.

: 102447-86-9

Mol F.

: C21H24O4

Mol W.

: 340.41

Cat No.

: SA26216

Exemestane, Impurities

16-Methylene 1,2-Dihydro Exemestane

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C21H26O2

Mol W.

: 310.44

Cat No.

: SA19119

Desoximetasone, Impurities

16,17-Didehydro 16-Demethyl Desoximetasone

Please enquire for price & pack size

Out of Stock

CAS No.

: 1234572-33-8

Mol F.

: C21H25FO4

Mol W.

: 360.42

Cat No.

: SA19205

Impurities, Prednisone

16,21-Didehydro 17-Dehydroxy Prednisone

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C21H22O4

Mol W.

: 338.4

Cat No.

: SA26209

Impurities, Progesterone

16α-Hydroxy Progesterone

Please enquire for price & pack size

Out of Stock

CAS No.

: 438-07-3

Mol F.

: C21H30O3

Mol W.

: 330.46

Cat No.

: SA18019

Flunisolide, Impurities

16α-Hydroxy-6α-fluoroprednisolone

Please enquire for price & pack size

Out of Stock

CAS No.

: 3915-36-4

Mol F.

: C21H27FO6

Mol W.

: 394.43

Cat No.

: SA47507

Impurities, Methylprednisolone

16α-MethylPrednisolone

$155.00 25 mg

Out of Stock

CAS No.

: 10417-63-7

Mol F.

: C22H30O5

Mol W.

: 374.47

Cat No.

: SA14420

Impurities, Methylprednisolone

16α-Methylprednisolone 21-Acetate

$555.00 25 mg

Out of Stock

CAS No.

: 13209-52-4

Mol F.

: C24H32O6

Mol W.

: 416.51

Cat No.

: SA14419

Exemestane, Impurities

16α, 17α-Epoxy Exemestane Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C20H24O2

Mol W.

: 296.39999999999998

Cat No.

: SA19114

Halcinonide, Impurities

16α,17α-Dihydroxy Halcinonide

Please enquire for price & pack size

Out of Stock

CAS No.

: 982-91-2

Mol F.

: C21H28ClFO5

Mol W.

: 414.89

Cat No.

: SA30401

Ethinylestradiol, Impurities

16α,17α-Epoxy-19-norpregna-1,3,5(10)-trien-20-yn-3-ol Acetate

Please enquire for price & pack size

Out of Stock

CAS No.

: 55812-84-5

Mol F.

: C22H24O3

Mol W.

: 336.42

Cat No.

: SA13134

Ethisterone, Impurities

16β-Hydroxy-17-epi-norethisterone

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C₂₀H₂₆O₃

Mol W.

: 314.42

Cat No.

: SA12902

Ethinylestradiol, Impurities

16β-Hydroxy-17α-Ethinylestradiol

Please enquire for price & pack size

Out of Stock

CAS No.

: 10084-25-0

Mol F.

: C20H24O3

Mol W.

: 312.41

Cat No.

: SA13116

Dutasteride, Impurities

17-carboxamide Dutasteride

Please enquire for price & pack size

Out of Stock

CAS No.

: 104214-61-1

Mol F.

: C19H28N2O2

Mol W.

: 316.44

Cat No.

: SA35213

Difluoroprednisolone, Impurities

17-Dehydroxy-17-des(hydroxyacetyl)-17β-methyl-6α,9α-Difluoroprednisolone

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C20H26F2O2

Mol W.

: 336.42

Cat No.

: SA14209

Ethinylestradiol, Impurities

17-Dehydroxy-dehydro 17-epi-Ethinylestradiol

Please enquire for price & pack size

Out of Stock

CAS No.

: 71716-18-2

Mol F.

: C20H22O

Mol W.

: 278.39

Cat No.

: SA13125

Impurities, Norethindrone

17-Desethynyl 17-Dibromomethylaceto-norethindrone Acetate

Please enquire for price & pack size

Out of Stock

CAS No.

: 40228-41-9

Mol F.

: C22H28Br2O4

Mol W.

: 516.26

Cat No.

: SA13430

Impurities, Loteprednol

17-Methoxycarbonyl Loteprednol

Please enquire for price & pack size

Out of Stock

CAS No.

: 265651-89-6

Mol F.

: C23H29ClO7

Mol W.

: 452.92

Cat No.

: SA27608

Impurities, Methylprednisolone

17-O-Acetyl-6-methylprednisolone

$295.00 25 mg

Out of Stock

CAS No.

: 86401-94-7

Mol F.

: C24H32O6

Mol W.

: 416.51

Cat No.

: SA14416

Impurities, Norethindrone

17-O-Trimethylsilyl 6,7-Dehydro Norethindrone

Please enquire for price & pack size

Out of Stock

CAS No.

: 300542-58-9

Mol F.

: C23H32O2Si

Mol W.

: 368.58

Cat No.

: SA13432

Impurities, Norethindrone

17-O-Trimethylsilyl Norethindrone

Please enquire for price & pack size

Out of Stock

CAS No.

: 28426-43-9

Mol F.

: C23H34O2Si

Mol W.

: 370.6

Cat No.

: SA13433

Beclomethasone Dipropionate, Impurities

17,21-Dihydroxy-16β-methylpregna-1,4-diene-3,20-dione Dipropionate

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C28H38O6

Mol W.

: 470.6

Cat No.

: SA15617

Equilin, Impurities

17α-Dihydro Equilin

Please enquire for price & pack size

Out of Stock

CAS No.

: 651-55-8

Mol F.

: C18H22O2

Mol W.

: 270.37

Cat No.

: SA16402

Ethinylestradiol, Impurities

17α-Dihydro-17β-ethinyl-equillenin

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C20H20O2

Mol W.

: 292.37

Cat No.

: SA13133

Impurities, Norethindrone

17α-Ethinyl-17β-acetoxy-3,5-estradiene

Please enquire for price & pack size

Out of Stock

CAS No.

: 64850-62-0

Mol F.

: C22H28O2

Mol W.

: 324.46

Cat No.

: SA13434

Ethinylestradiol, Impurities

17α-Ethinylestradiol

Please enquire for price & pack size

Out of Stock

CAS No.

: 57-63-6

Mol F.

: C20H24O2

Mol W.

: 296.41

Cat No.

: SA13117

Exemestane, Impurities

17α-hydroxy-17β-Acetyl Exemestane

Please enquire for price & pack size

Out of Stock

CAS No.

: 1160599-91-6

Mol F.

: C22H28O3

Mol W.

: 340.46

Cat No.

: SA19120

Halcinonide, Impurities

17β-carboxylic acid Halcinonide

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C23H31FO6

Mol W.

: 422.49

Cat No.

: SA30415

Equilin, Impurities

17β-Dihydro Equilin

Please enquire for price & pack size

Out of Stock

CAS No.

: 3563-27-7

Mol F.

: C18H22O2

Mol W.

: 270.37

Cat No.

: SA16403

Ethinylestradiol, Impurities

17β-Dihydro-17α-ethinyl-14β-equillenin

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C20H20O2

Mol W.

: 292.37

Cat No.

: SA13132

Estradiol, Impurities

17β-Estradiol 3-O-Sulfate Sodium Salt

Please enquire for price & pack size

Out of Stock

CAS No.

: 4999-79-5

Mol F.

: C₁₈H₂₃NaO₅S

Mol W.

: 374.43

Cat No.

: SA13215

Estradiol, Impurities

17β-Estradiol Diacetate

Please enquire for price & pack size

Out of Stock

CAS No.

: 3434-88-6

Mol F.

: C₂₂H₂₈O₄

Mol W.

: 356.46

Cat No.

: SA13213

Estradiol, Impurities

17β-Estradiol Dimethyl Ether

Please enquire for price & pack size

Out of Stock

CAS No.

: 4954-14-7

Mol F.

: C₂₀H₂₈O₂

Mol W.

: 300.44

Cat No.

: SA13212

Estradiol, Impurities

17β-Estradiol; Estradiol Valerate Impurity A

Please enquire for price & pack size

Out of Stock

CAS No.

: 50-28-2 (anhydrous); 35380-71-3 (hemihydrate)

Mol F.

: C18H24O2 (anhydrous); C18H24O2 . 1/2 H2O (hemihydrate)

Mol W.

: 272.38 (anhydrous); 281.40(hemihydrate)

Cat No.

: SA13211

Exemestane, Impurities

17β-Hydroxy Exemestane

Please enquire for price & pack size

Out of Stock

CAS No.

: 122370-91-6

Mol F.

: C₂₀H₂₆O₂

Mol W.

: 298.42

Cat No.

: SA19116

Exemestane, Impurities

17β-Hydroxy Exemestane Sulfamate

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C20H27NO4S

Mol W.

: 377.5

Cat No.

: SA19115

Ethinylestradiol, Impurities

18-Methyl Ethinylestradiol

Please enquire for price & pack size

Out of Stock

CAS No.

: 14012-72-7

Mol F.

: C21H26O2

Mol W.

: 310.43

Cat No.

: SA13129

Aprepitant, Impurities

1R, 2S, 3S-CAH impurity

$550.00 25 mg

Out of Stock

CAS No.

: 1333998-27-8 (HCl); 170902-80-4 (Base)

Mol F.

: C20H19ClF7NO2

Mol W.

: 473.81

Cat No.

: SA43702

Aprepitant, Impurities

1S, 2R, 3R-CAH impurity

$550.00 25 mg

Out of Stock

CAS No.

: 1333998-21-2 (HCl salt); 1242175-36-5

Mol F.

: C20H19ClF7NO2

Mol W.

: 473.81

Cat No.

: SA43705

Aprepitant, Impurities

1S, 2S, 3S-CAH impurity

$550.00 25 mg

Out of Stock

CAS No.

: 1242175-38-7 (Base); 1333995-14-4 (HCl salt)

Mol F.

: C20H19ClF7NO2

Mol W.

: 473.81

Cat No.

: SA43706

Eplerenone, Impurities

1α-Hydroxy Mexrenone

Please enquire for price & pack size

Out of Stock

CAS No.

: 192704-56-6

Mol F.

: C24H32O6

Mol W.

: 416.51

Cat No.

: SA41809

Cariprazine, Impurities

2-((1r,4r)-4-(3,3-Dimethylureido)cyclohexyl)acetic acid

Please enquire for price & pack size

Out of Stock

CAS No.

: 1957145-59-3

Mol F.

: C11H20N2O3

Mol W.

: 228.3

Cat No.

: SA39717

Impurities, Ribociclib

2-((2-Chloro-7-cyclopentyl-7H-pyrrolo[2,3-d]pyrimidin-6-yl)methoxy)-7-cyclopentyl-N,N-dimethyl-7H-pyrrolo[2,3-d]pyrimidine-6-carboxamide