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Impurities

SynThink is a trusted producer and supplier of Pharmaceutical Reference Standards, including Impurity Standards. These materials are essential for pharmaceutical companies conducting research into the quality, stability, and biological safety of drug products. We maintain a robust inventory of API impurities, ready to support your development and regulatory needs.

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Ezetimibe, Impurities

(3’S,3R,4S)-Desfluoro Ezetimibe

$250.00 25 mg

In Stock

CAS No.

: 190595-66-5

Mol F.

: C24H22FNO3

Mol W.

: 391.43

Cat No.

: SA14808

Ezetimibe, Impurities

(3’S)-ent-Ezetimibe; SSR-Ezetimibe

$275.00 25 mg

In Stock

CAS No.

: 1593543-00-0

Mol F.

: C24H21F2NO3

Mol W.

: 409.43

Cat No.

: SA14814

Impurities, Ticagrelor

(3aR,4S,6R,6aS)-6-Aminotetrahydro-2,2-dimethyl-4H-cyclopenta-1,3-dioxol-4-ol

Please enquire for price & pack size

In Stock

CAS No.

: 155899-66-4

Mol F.

: C8H15NO3

Mol W.

: 173.21

Cat No.

: SA32517

Impurities, Nintedanib

(3E)-2,3-Dihydro-3-(methoxyphenylmethylene)-2-oxo-1H-Indole-6-carboxylic Acid Methyl Ester

$85.00 25 mg

In Stock

CAS No.

: 1168150-46-6

Mol F.

: C18H15NO4

Mol W.

: 309.31

Cat No.

: SA22508

Impurities, Tofacitinib

(3R,4R)-1-Benzyl-N,4-dimethylpiperidin-3-amine dihydrochloride

$90.00 25 mg

In Stock

CAS No.

: 1062580-52-2 (2HCl)

Mol F.

: C14H24Cl2N2

Mol W.

: 291.26

Cat No.

: SA43320

Atorvastatin, Impurities

(3R,5R)-6-Cyano-3,5-dihydroxy-hexanoic Acid tert-Butyl Ester

$395.00 500 mg

In Stock

CAS No.

: 125971-93-9

Mol F.

: C11H19NO4

Mol W.

: 229.27

Cat No.

: SA17841

Atorvastatin, Impurities

(3R,5R)-Atorvastatin Amide impurity

$250.00 25 mg

In Stock

CAS No.

: 2125501-02-0

Mol F.

: C33H36FN3O4

Mol W.

: 557.66

Cat No.

: SA17844

Impurities, Rosuvastatin

(3R,5R)-tert-butyl 6-chloro-3,5-dihydroxyhexanoate

$355.00 50 mg

In Stock

CAS No.

: 404958-69-6

Mol F.

: C10H19ClO4

Mol W.

: 238.71

Cat No.

: SA12192

Atorvastatin, Impurities

(3R,5S)-Atorvastatin Calcium salt

$195.00 10 mg

In Stock

CAS No.

: 1312366-79-2

Mol F.

: C33H35FN2O5 : 1/2(Ca)

Mol W.

: 558.7 1/2 (40.1)

Cat No.

: SA17840

Ibrutinib, Impurities

(3R)-3-[4-Amino-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl]-1-piperidinecarboxylic Acid Phenylmethyl Ester

Please enquire for price & pack size

In Stock

CAS No.

: 2012523-59-8

Mol F.

: C30H28N6O3

Mol W.

: 520.58

Cat No.

: SA47409

Impurities, Paroxetine

(3S,4R)-N-Methyl Paroxol

Please enquire for price & pack size

In Stock

CAS No.

: 105812-81-5

Mol F.

: C13H18FNO

Mol W.

: 223.29

Cat No.

: SA18318

Impurities, Tofacitinib

(3S,4S)-1-Benzyl-N,4- dimethylpiperidin-3-amine

Please enquire for price & pack size

In Stock

CAS No.

: 1354486-07-9

Mol F.

: C14H22N2

Mol W.

: 218.34

Cat No.

: SA43326

Impurities, Pitavastatin

(3S,5R,E)-Tert-butyl 7-(2-cyclopropyl-4-(4-fluorophenyl)quinolin-3-yl)-3,5-dihydroxyhept-6-enoate

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C29H32FNO4

Mol W.

: 477.57

Cat No.

: SA29525

Atorvastatin, Impurities

(3S,5R)-6-Cyano-3,5-dihydroxy-hexanoic Acid tert-Butyl Ester

$150.00 25 mg

In Stock

CAS No.

: 186508-94-1

Mol F.

: C₁₁H₁₉NO₄

Mol W.

: 229.27

Cat No.

: SA17833

Atorvastatin, Impurities

(3S,5R)-Atorvastatin Calcium Salt

$195.00 10 mg

In Stock

CAS No.

: 887196-25-0 (calcium salt); 887324-52-9 (acid)

Mol F.

: C33H34FN2O5 .1/2 Ca

Mol W.

: 577.67

Cat No.

: SA17827

Impurities, Rosuvastatin

(3S,5S)-tert-butyl 6-chloro-3,5-dihydroxyhexanoate

$250.00 25 mg

In Stock

CAS No.

: 325471-28-1

Mol F.

: C10H19ClO4

Mol W.

: 238.71

Cat No.

: SA12191

Impurities, Rosuvastatin

(3S)-4-Chloro-3-hydroxybutyronitrile

$70.00 25 mg

In Stock

CAS No.

: 127913-44-4

Mol F.

: C4H6ClNO

Mol W.

: 119.55

Cat No.

: SA12125

Bromfenac, Impurities

(4-bromophenyl)(indolin-7-yl)methanone

Please enquire for price & pack size

In Stock

CAS No.

: 91714-41-9

Mol F.

: C15H12BrNO

Mol W.

: 302.16

Cat No.

: SA18917

Clotrimazole, Impurities

(4-Chlorophenyl)diphenylmethanol

Please enquire for price & pack size

In Stock

CAS No.

: 6922-89-0

Mol F.

: C19H15ClO

Mol W.

: 294.77

Cat No.

: SA11605

Atorvastatin, Impurities

(4R,6S)-3,5-Dihydroxy-6-cyanohexanoic acid tertbutyl ester

$170.00 25 mg

In Stock

CAS No.

Mol F.

: C11H19NO4

Mol W.

: 229.13

Cat No.

: SA17829

Dorzolamide, Impurities

(4R,6S)-5,6-Dihydro-6-methyl-4H-thieno[2,3-b]thiopyran-4-ol 7,7-Dioxide

$95.00 25 mg

In Stock

CAS No.

: 147128-77-6

Mol F.

: C8H10O3S2

Mol W.

: 218.29

Cat No.

: SA24108

Atorvastatin, Impurities

(4R,6S)-6-(Cyanomethyl)-2,2-dimethyl-1,3-dioxane-4-acetic Acid tert-Butyl Ester

$220.00 50 mg

In Stock

CAS No.

: 196085-84-4

Mol F.

: C14H23NO4

Mol W.

: 269.34

Cat No.

: SA17828

Ezetimibe, Impurities

(4R)-4-Phenyl-1,3-oxazolidin-2-one

$80.00 25 mg

In Stock

CAS No.

: 90319-52-1

Mol F.

: C9H9NO2

Mol W.

: 163.17

Cat No.

: SA14842

Brivaracetam, Impurities

(4S)-Brivaracetam

$395.00 25 mg

In Stock

CAS No.

: 357336-19-7

Mol F.

: C11H20N2O2

Mol W.

: 212.3

Cat No.

: SA47303

Impurities, Olmesartan Medoxomil

(5-(chloromethyl)-2-oxo-1,3-dioxol-4-yl)methyl 1-((2′-(1H-tetrazol-5-yl)biphenyl-4-yl)methyl)-4-(2-hydroxypropan-2-yl)-2-propyl-1H-imidazole-5-carboxylate

$395.00 25 mg

In Stock

CAS No.

: 896419-18-4

Mol F.

: C29H29ClN6O6

Mol W.

: 593.03

Cat No.

: SA17756

Dapagliflozin, Impurities

(5-Bromo-2-chlorophenyl)(4- ethoxyphenyl)methanol

$225.00 25 mg

In Stock

CAS No.

: 1280647-32-6

Mol F.

: C14H12BrClO2

Mol W.

: 327.6

Cat No.

: SA15044

Dapagliflozin, Impurities

(5-Bromo-2-chlorophenyl)(4-ethoxyphenyl)methanone

$225.00 25 mg

In Stock

CAS No.

: 461432-22-4

Mol F.

: C15H12BrClO2

Mol W.

: 339.61

Cat No.

: SA15045

Empagliflozin, Impurities

(5-Bromo-2-chlorophenyl)(4-fluorophenyl)methanone

Please enquire for price & pack size

In Stock

CAS No.

: 915095-85-1

Mol F.

: C13H7BrClFO

Mol W.

: 313.55

Cat No.

: SA15139

Dapagliflozin, Impurities

(5-Bromo-2-chlorophenyl)(4-hydroxyphenyl)methanone

$195.00 25 mg

In Stock

CAS No.

: 1360568-68-8

Mol F.

: C13H8BrClO2

Mol W.

: 332.94

Cat No.

: SA15036

Atorvastatin, Impurities

(5R)-6-Cyano-5-hydroxy-3-oxo-hexanoic Acid tert-Butyl Ester

$175.00 100 mg

In Stock

CAS No.

: 125988-01-4

Mol F.

: C11H17NO4

Mol W.

: 227.26

Cat No.

: SA17839

Cefadroxil, Impurities

(6R,7R)-7-amino-8-oxo-3-vinyl-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid

Please enquire for price & pack size

In Stock

CAS No.

: 79349-82-9

Mol F.

: C9H10N2O3S

Mol W.

: 226.25

Cat No.

: SA42314

Hydrocortisone, Impurities

(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]phenanthrene-17-carboxylic acid

Please enquire for price & pack size

In Stock

CAS No.

: 3597-45-3

Mol F.

: C20H28O5

Mol W.

: 348.43

Cat No.

: SA15232

Betamethasone Dipropionate, Impurities

(E)-Betamethasone-∆17,20 21-Aldehyde

$295.00 25 mg

In Stock

CAS No.

: 52647-07-1

Mol F.

: C22H27FO4

Mol W.

: 374.45

Cat No.

: SA14510

Ezetimibe, Impurities

(N-1) of 3′-deshydroxy ezetimibe acid

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C25H25F2NO3

Mol W.

: 425.47

Cat No.

: SA14853

Impurities, Salmeterol

(N-1) of Salmeterol EP Impurity C

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C39H49NO4

Mol W.

: 595.81

Cat No.

: SA10112

Diltiazem, Impurities

(R,R)-Diltiazem

Please enquire for price & pack size

In Stock

CAS No.

: 75472-92-3

Mol F.

: C22H26N2O4S

Mol W.

: 414.5

Cat No.

: SA19532

Efinaconazole, Impurities

(R,R)-Efinaconazole Epoxide

Please enquire for price & pack size

In Stock

CAS No.

: 135270-13-2

Mol F.

: C12H11F2N3O

Mol W.

: 251.23

Cat No.

: SA23608

Efinaconazole, Impurities

(R,R)-Efinaconazole KSM- Protected Epoxy Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 135267-12-8

Mol F.

: C15H18F2O3

Mol W.

: 284.3

Cat No.

: SA23625

Ibrutinib, Impurities

(R)-1-(3-(4-amino-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)piperidin-1-yl)-3-chloropropan-1-one

Please enquire for price & pack size

In Stock

CAS No.

: 1288338-96-4

Mol F.

: C25H25ClN6O2

Mol W.

: 476.96

Cat No.

: SA47420

Apremilast, Impurities

(R)-1-(3-ethoxy-4- methoxyphenyl)-2- (methylsulfonyl)ethyl amine

Please enquire for price & pack size

In Stock

CAS No.

: 608142-27-4

Mol F.

: C12H19NO4S

Mol W.

: 273.35

Cat No.

: SA30021

Cetirizine, Impurities

(R)-1-[(4-Chlorophenyl)phenylmethyl]piperazine

Please enquire for price & pack size

In Stock

CAS No.

: 300543-56-0

Mol F.

: C17H19ClN2

Mol W.

: 286.8

Cat No.

: SA13501

Impurities, Linagliptin

(R)-2-((1-(7-(but-2-yn-1-yl)-3-methyl-1-((4-methylquinazolin-2-yl)methyl)-2,6-dioxo-2,3,6,7-tetrahydro-1Hpurin-8-yl)piperidin-3-yl)carbamoy

Please enquire for price & pack size

In Stock

CAS No.

: 2074688-81-4

Mol F.

: C33H32N8O5

Mol W.

: 620.7

Cat No.

: SA49910

Empagliflozin, Impurities

(R)-3-(4-(5-bromo-2-chlorobenzyl)phenoxy)tetrahydrofuran

Please enquire for price & pack size

In Stock

CAS No.

: 915095-90-8

Mol F.

: C17H16BrClO2

Mol W.

: 367.7

Cat No.

: SA15134

Ibrutinib, Impurities

(R)-3-(4-Phenoxyphenyl)-1-(piperidin-3-yl)-1H-pyrazolo[3,4-d]pyrimidin-4-amine

Please enquire for price & pack size

In Stock

CAS No.

: 1022150-12-4

Mol F.

: C22H22N6O

Mol W.

: 386.45

Cat No.

: SA47411

Dapoxetine, Impurities

(R)-Dapoxetine Hydrochloride

Please enquire for price & pack size

In Stock

CAS No.

: 156453-51-9

Mol F.

: C21H23NOHCl"

Mol W.

: 341.87

Cat No.

: SA23001

Impurities, Timolol

(R)-Didemethyltimolol Maleate

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C15H24N4O7

Mol W.

: 404.44

Cat No.

: SA23214

Duloxetine, Impurities

(R)-Duloxetine; Duloxetine EP Impurity A

$200.00 25 mg

In Stock

CAS No.

: 116539-60-7(base); 910138-96-4(HCl)

Mol F.

: C18H19NOS

Mol W.

: 297.42

Cat No.

: SA36301

Impurities, Timolol

(R)-Hydroxy Timolol

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C13H24N4O4S

Mol W.

: 332.15

Cat No.

: SA23222

Impurities, Nitrosamine, Venlafaxine

(R)-N-(2-(1-hydroxycyclohexyl)-2-(4-hydroxyphenyl)ethyl)-N-methylnitrous amide

$395.00 50 mg

In Stock

CAS No.

Mol F.

: C15H22N2O3

Mol W.

: 278.35

Cat No.

: SA22742

Dolutegravir, Impurities

(R)-N-(2,4-Difluorobenzyl)-9-hydroxy-2-(4-hydroxybutan-2-yl)-1,8-dioxo-2,3,4,8-tetrahydro-1H-pyrido[1,2-a]pyrazine-7-carboxamide