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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, Sacubitril

(2R,4R)-Sacubitril Isomer

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Out of Stock

CAS No.

: 766480-48-2

Mol F.

: C24H29NO5

Mol W.

: 411.49

Cat No.

: SA40903

Argatroban, Impurities

(2R,4R)1-[(2S)2-Amino-5-[[imino(nitroamino)methyl]amino]-1-oxopentyl]-4-methyl-2-piperidinecarboxylic Acid Ethyl Ester Hydrochloride

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Out of Stock

CAS No.

: 74874-08-1 (HCl)

Mol F.

: C15H28N6O5

Mol W.

: 408.88

Cat No.

: SA48406

Argatroban, Impurities

(2R,4S)-Ethyl 4-methyl-1-((S)-1-phenylethyl)piperidine-2-carboxylate

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Out of Stock

CAS No.

: 1350815-39-2

Mol F.

: C17H25NO2

Mol W.

: 275.39

Cat No.

: SA48413

Impurities, Sacubitril

(2R,4S)-Sacubitril

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Out of Stock

CAS No.

: 149709-62-6

Mol F.

: C‚„H‚‰NO…

Mol W.

: 411.49

Cat No.

: SA40900

Cobicistat, Impurities

(2R,5R)-1,6-Diphenylhexane-2,5-diamine dihydrochloride

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Out of Stock

CAS No.

: 1247119-31-8

Mol F.

: C18H26Cl2N2

Mol W.

: 341.32

Cat No.

: SA48602

Emtricitabine, Impurities

(2R,5R)-L-Menthol-5-(acetyloxy)-1,3-oxathiolane-2-carboxylate

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Out of Stock

CAS No.

: 147027-09-6

Mol F.

: C₁₆H₂₆O₅S

Mol W.

: 330.44

Cat No.

: SA22912

Argatroban, Impurities

(2R)-Ethyl 4-methyl-1-((S)-1-phenylethyl)piperidine-2-carboxylate

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Out of Stock

CAS No.

: 139334-63-7

Mol F.

: C17H25NO2

Mol W.

: 275.39

Cat No.

: SA48412

Impurities, Lamivudine

(2S-cis)-5-Fluoro-1-[2-(hydroxymethyl)-1,3-oxathiolan-5-yl]-2,4(1H,3H)-pyrimidinedione

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Out of Stock

CAS No.

: 145281-92-1

Mol F.

: C8H9FN2O4S

Mol W.

: 248.23

Cat No.

: SA22315

Impurities, Nebivolol

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

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Out of Stock

CAS No.

: 129050-23-3

Mol F.

: C11H11FO2

Mol W.

: 194.2

Cat No.

: SA14703

Ethambutol, Impurities

(2S,13S)-2,13-diethyl-6,9-bis((S)-1-hydroxybutan-2-yl)-3,6,9,12-tetraazatetradecane-1,14-diol

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Out of Stock

CAS No.

Mol F.

: C22H50N4O4

Mol W.

: 434.66

Cat No.

: SA43801

Ethambutol, Impurities

(2S,2’S)-2,2′-(2,2′-((S)-1-hydroxybutan-2-ylazanediyl)bis(ethane-2,1-diyl))bis(azanediyl)dibutan-1-ol hydrochloride salt

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Out of Stock

CAS No.

Mol F.

: C16H37N3O3

Mol W.

: 319.48

Cat No.

: SA43800

Impurities, Timolol

(2S,2’S)-3,3’-((1,2,5-Thiadiazole-3,4-diyl)bis(oxy))bis(1-(tert-butylamino)propan-2-ol)

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Out of Stock

CAS No.

: NA

Mol F.

: C16H32N4O4S

Mol W.

: 376.51

Cat No.

: SA23211

Impurities, Remdesivir

(2S,3R,4R,5R)-2-(4-aminopyrrolo[2,1-f][1,2,4]triazin-7-yl)-3,4-bis(benzyloxy)-5-((benzyloxy)methyl)tetrahydrofuran-2-carbonitrile

Please enquire for price & pack size

Out of Stock

CAS No.

: 1369903-46-7

Mol F.

: C33H31N5O4

Mol W.

: 561.6

Cat No.

: SA42729

Empagliflozin, Impurities

(2S,3R,4R,5S,6R)-2-(4-bromo-3-(4- ((S)-tetrahydrofuran-3- yloxy)benzyl)phenyl)-6- (hydroxymethyl)tetrahydro-2Hpyran- 3,4,5-triol

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C23H27BrO7

Mol W.

: 495.36

Cat No.

: SA15137

Impurities, Isavuconazole

(2S,3R)-3-(2,5-difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)butanenitrile

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Out of Stock

CAS No.

: 170862-36-9

Mol F.

: C13H12F2N4O

Mol W.

: 278.26

Cat No.

: SA44120

Empagliflozin, Impurities

(2S,3S,4R,5S,6R)-2-(4-Chloro-3-(4-(((S)-tetrahydrofuran-3-yl)oxy)benzyl)phenyl)-6-(hydroxymethyl)tetrahydro-2H-pyran-3,4,5-triol

Please enquire for price & pack size

Out of Stock

CAS No.

: 2452301-28-7

Mol F.

: C23H27ClO7

Mol W.

: 450.9

Cat No.

: SA15156

Impurities, Sapropterin

(2S,3S,4S,E)-1-(2-phenylhydrazono)pentane-2,3,4-triol

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Out of Stock

CAS No.

: 59245-36-2

Mol F.

: C11H16N2O3

Mol W.

: 224.26

Cat No.

: SA45216

Impurities, Isavuconazole

(2S,3S)-2-(2,5-difluorophenyl)- 1-(1H-1,2,4-triazol-1- yl)butane-2,3-diol

$550.00 25 mg

Out of Stock

CAS No.

Mol F.

: C12H13F2N3O2

Mol W.

: 269.25

Cat No.

: SA44124

Impurities, Nirmatrelvir

(2S,3S)-3-(2-Chloropropan-2-yl)-N-((S)-1-cyano-2-((S)-2-oxopyrrolidin-3-yl)ethyl)-1-((S)-3,3-dimethyl-2-(2,2,2-trifluoroacetamido)butanoyl)

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Out of Stock

CAS No.

: NA

Mol F.

: C23H33ClF3N5O4

Mol W.

: 536

Cat No.

: SA46908

Impurities, Sacubitril

(2S,4R)-Sacubitril; Sacubitril Enantiomer

Please enquire for price & pack size

Out of Stock

CAS No.

: 761373-05-1

Mol F.

: C‚„H‚‰NO…

Mol W.

: 411.49

Cat No.

: SA40904

Impurities, Sacubitril

(2S,4S)-Sacubitri Isomer

Please enquire for price & pack size

Out of Stock

CAS No.

: 149709-63-7

Mol F.

: C‚„H‚‰NO…

Mol W.

: 411.49

Cat No.

: SA40905

Emtricitabine, Impurities

(2S,5R) Emtricitabine Carboxylic Acid

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Out of Stock

CAS No.

: NA

Mol F.

: C8H8FN3O4S

Mol W.

: 261.23

Cat No.

: SA22913

Impurities, Ritlecitinib

(2S,5R)-benzyl 5-(2-chloro-7H-pyrrolo[2,3-d]pyrimidin-4-ylamino)-2-methylpiperidine-1-carboxylate

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C20H22ClN5O2

Mol W.

: 399.87

Cat No.

: SA50005

Emtricitabine, Impurities

(2S,5S) Emtricitabine Carboxylic Acid

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C8H8FN3O4S

Mol W.

: 261.23

Cat No.

: SA22915

Emtricitabine, Impurities

(2S,5S)-D-Menthol-5-(acetyloxy)-1,3-oxathiolane-2-carboxylate

Please enquire for price & pack size

Out of Stock

CAS No.

: 147126-68-9

Mol F.

: C₁₆H₂₆O₅S

Mol W.

: 330.44

Cat No.

: SA22908

Impurities, Nirmatrelvir

(2S)-3-(2-chloropropan-2-yl)-N-((S)-1-cyano-2-((S)-2-oxopyrrolidin-3-yl)ethyl)-1-((S)-3,3-dimethyl-2-(2,2,2-trifluoroacetamido)butanoyl)pyr

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C23H33ClF3N5O4

Mol W.

: 536

Cat No.

: SA46907

Impurities, Nirmatrelvir

(2S)-N-((S)-1-Cyano-2-((S)-2-oxopyrrolidin-3-yl)ethyl)-1-((S)-3,3-dimethyl-2-(2,2,2-trifluoroacetamido)butanoyl)-3-(trichloromethyl)pyrroli

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C21H27Cl3F3N5O4

Mol W.

: 576.79999999999995

Cat No.

: SA46905

Impurities, Sitagliptin

(2Z)-1-[5,6-Dihydro-3-(trifluoromethyl)-1,2,4-triazolo[4,3-a]pyrazin-7(8H)-yl]-4-(2,4,5-trifluorophenyl)-2-buten-1-one

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Out of Stock

CAS No.

: 1803026-54-1

Mol F.

: C16H12F6N4O

Mol W.

: 390.28

Cat No.

: SA10434

Impurities, Leflunomide

(2Z)-2-Cyano-N-(4-cyanophenyl)-3-hydroxy-2-Butenamide

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Out of Stock

CAS No.

: 202057-74-7

Mol F.

: C12H9N3O2

Mol W.

: 227.22

Cat No.

: SA21810

Chlorpromazine, Impurities

(3-bromo -propyl)-dimethyl amine

Please enquire for price & pack size

Out of Stock

CAS No.

: 53929-74-1

Mol F.

: C5H12BrN

Mol W.

: 166.06

Cat No.

: SA21602

Impurities, Raloxifene

(3-Chloro-6-hydroxy-2-(4-methoxyphenyl)benzo[b]thiophen-5-yl)(4-(2-(piperidin-1-yl)ethoxy)phenyl)methanone

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C29H28ClNO2S

Mol W.

: 522.02

Cat No.

: SA24915

Impurities, Raloxifene

(3-Chloro-6-hydroxy-2-(4-methoxyphenyl)benzo[b]thiophen-7-yl)(4-(2-(piperidin-1-yl)ethoxy)phenyl)methanone

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Out of Stock

CAS No.

: NA

Mol F.

: C29H28ClNO4S

Mol W.

: 522.04999999999995

Cat No.

: SA24916

Clotrimazole, Impurities

(3-Chlorophenyl)diphenylmethanol

Please enquire for price & pack size

Out of Stock

CAS No.

: 29647-82-3

Mol F.

: C19H15ClO

Mol W.

: 294.77

Cat No.

: SA11604

Impurities, Sitagliptin

(3-Des-trifluoromethyl-3-methyl) Sitagliptin

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C16H18F3N5O

Mol W.

: 353.54

Cat No.

: SA10428

Impurities, Nintedanib

(3E)-1-Acetyl-3-(ethoxyphenylmethylene)-2,3-dihydro-2-oxo-1H-indole-6-carboxylic Acid Methyl Ester

Please enquire for price & pack size

Out of Stock

CAS No.

: 1168152-06-4

Mol F.

: C21H19NO5

Mol W.

: 365.38

Cat No.

: SA22506

Gemcitabine, Impurities

(3R,4R)-1-ethoxy-2,2-difluoro-4,5-dihydroxy-1-oxopentan-3-yl benzoate impurity

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C14H16F2O6

Mol W.

: 318.27

Cat No.

: SA44521

Impurities, Tofacitinib

(3R,4R)-4-Methyl-3-(methyl-7H-pyrrolo[2,3-d]pyrimidin-4-ylamino)-β-oxo-1-piperidinepropanenitrile L-aspartate

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C20H27N7O5

Mol W.

: 445.47

Cat No.

: SA43312

Canagliflozin, Impurities

(3R,4S,5S,6R)-2-(3-((5-(4-fluorophenyl)thiophen-2-yl)methyl)-4-methylphenyl)-6-(hydroxymethyl)-2-methoxytetrahydro-2H-pyran-3,4,5-triol

Please enquire for price & pack size

Out of Stock

CAS No.

: 1030825-21-8

Mol F.

: C25H27FO6S

Mol W.

: 474.54

Cat No.

: SA14934

Impurities, Rosuvastatin

(3R,5R)-Rosuvastatin Ethyl Ester

$950.00 25 mg

Out of Stock

CAS No.

: 1776088-23-3

Mol F.

: C23H30FN3O6S

Mol W.

: 495.56

Cat No.

: SA12148

Impurities, Rosuvastatin

(3R,5S)-5-[(S)-8-Fluoro-4-isopropyl-2-(N-methylmethylsulfonamido)-5,6-dihydrobenzo[h]quinazolin-6-yl]-3,5-dihydroxypentanoic Acid tert-Butyl Ester

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C26H36FN3O6S

Mol W.

: 537.64

Cat No.

: SA12165

Impurities, Rosuvastatin

(3R,5S)-6-Chloro-3,5-dihydroxyhexanoic Acid tert-Butyl Ester

$100.00 25 mg

Out of Stock

CAS No.

: 154026-93-4

Mol F.

: C10H19ClO4

Mol W.

: 238.71

Cat No.

: SA12126

Impurities, Rosuvastatin

(3R,5S)-tert-butyl 3,5-dihydroxy-6-(5-methyl-1,3,4-thiadiazol-2-ylsulfonyl)hexanoate

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C13H22N2O6S2

Mol W.

: 366.45

Cat No.

: SA121130

Atorvastatin, Impurities

(3R)-4-Cyano-3-hydroxybutanoic Acid Ethyl Ester

$100.00 100 mg

Out of Stock

CAS No.

: 141942-85-0

Mol F.

: C7H11NO3

Mol W.

: 157.17

Cat No.

: SA17843

Impurities, Rosuvastatin

(3RS,5RS,6E)-7-[4-(4-Fluorophenyl)-6-(1-methylethyl)-2-[methyl(methylsulfonyl)amino]pyrimidin-5-yl]-3,5-dihydroxyhept-6-enoic Acid

Please enquire for price & pack size

Out of Stock

CAS No.

: 1007912-86-8 (Free Base)

Mol F.

: C22H28FN3O6S

Mol W.

: 481.54

Cat No.

: SA121118

Exemestane, Impurities

(3S,5R,6R,8R,9S,10R,13S,14S,17S)-10,13-dimethylhexadecahydro-1H-cyclopenta[a]phenanthrene-3,6,17-triol

Please enquire for price & pack size

Out of Stock

CAS No.

: 600178-04-9

Mol F.

: C19H32O3

Mol W.

: 308.46

Cat No.

: SA19132

Impurities, Rosuvastatin

(3S,5R,7R)-Rosuvstatin Impurity I (EP)

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C22H27FN3NaO6S

Mol W.

: 503.52

Cat No.

: SA12163

Impurities, Rosuvastatin

(3S,5S,7R)- Rosuvastatin Impurity I (EP) Sodium Salt

$2,550.00 25 mg

Out of Stock

CAS No.

Mol F.

: C22H27FN3NaO6S

Mol W.

: 503.52

Cat No.

: SA12162

Impurities, Rosuvastatin

(3S,5S)-Rosuvastatin Calcium Salt

$1,550.00 25 mg

Out of Stock

CAS No.

: 1584149-34-7; 2185805-14-3

Mol F.

: C22H27FN3O6S.1/2Ca

Mol W.

: 500.61

Cat No.

: SA12150

Impurities, Neostigmine

(4-METHOXY-PHENYL)-DIMETHYL-AMINE

Please enquire for price & pack size

Out of Stock

CAS No.

: 701-56-4

Mol F.

: C9H13NO

Mol W.

: 151.21

Cat No.

: SA19713

Impurities, Vericiguat

(4,6-Diamino-2-(5-fluoro-1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)pyrimidin-5-yl)carbamic acid