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

Donepezil, Impurities

USP Donepezil Related Compound A

Please enquire for price & pack size

Out of Stock

CAS No.

: 145546-80-1

Mol F.

: C₂₄H₂₇NO₃

Mol W.

: 377.48

Cat No.

: SA34308

Impurities, Loratadine

USP Loratadine Related Compound C

$75.00 25 mg

Out of Stock

CAS No.

: 31251-41-9

Mol F.

: C14H10ClNO

Mol W.

: 243.69

Cat No.

: SA34002

Impurities, Nicardipine

USP Nicardipine Related Compound A

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C16H16N2O6

Mol W.

: 332.31

Cat No.

: SA36201

Impurities, Nicardipine

USP Nicardipine Related Compound C

Please enquire for price & pack size

Out of Stock

CAS No.

: 21881-77-6

Mol F.

: C17H18N2O6

Mol W.

: 346.33

Cat No.

: SA36203

Impurities, Nicardipine

USP Nicardipine Related Compound D

Please enquire for price & pack size

Out of Stock

CAS No.

: 499-81-0

Mol F.

: C7H5NO4

Mol W.

: 167.12

Cat No.

: SA36210

Impurities, Losartan

Valeric Acid

Please enquire for price & pack size

Out of Stock

CAS No.

: 109-52-4

Mol F.

: C5H10O2

Mol W.

: 102.13

Cat No.

: SA26716

Ganciclovir, Impurities

Valganciclovir Hydrochloride

Please enquire for price & pack size

Out of Stock

CAS No.

: 175865-59-5

Mol F.

: C₁₄H₂₃ClN₆O₅

Mol W.

: 390.82

Cat No.

: SA13716

Impurities, Valsartan

Valsartan (2-Cyanophenyl)benzyl alcohol Impurity| CAS : 154709-19-0

Please enquire for price & pack size

Out of Stock

CAS No.

: 154709-19-0

Mol F.

: C14H11NO

Mol W.

: 209.24

Cat No.

: SA33320

Impurities, Valsartan

Valsartan (2-Cyanophenyl)benzyl Dimer Impurity | CAS : 1353844-77-5

Please enquire for price & pack size

Out of Stock

CAS No.

: 1353844-77-5

Mol F.

: C34H31N3O2

Mol W.

: 513.6

Cat No.

: SA33321

Impurities, Valsartan

Valsartan De-oxopentyl Methyl Ester

Please enquire for price & pack size

Out of Stock

CAS No.

: 1111177-20-8

Mol F.

: C20H22N2O2

Mol W.

: 322.39999999999998

Cat No.

: SA33303

Impurities, Valsartan

Valsartan Descarboxylic acid

Please enquire for price & pack size

Out of Stock

CAS No.

: 1314799-74-0

Mol F.

: C23H29N5O

Mol W.

: 391.51

Cat No.

: SA33300

Impurities, Valsartan

Valsartan Descarboxylic acid diazirine impurity

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C23H29N3O

Mol W.

: 363.49

Cat No.

: SA33301

Impurities, Valsartan

Valsartan Desvaleryl Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 676129-92-3

Mol F.

: C19H21N5O2

Mol W.

: 351.4

Cat No.

: SA33302

Impurities, Valsartan

Valsartan Desvaleryl Nitrile Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 1071286-94-6

Mol F.

: C19H20N2O2

Mol W.

: 308.37

Cat No.

: SA33313

Impurities, Valsartan

Valsartan Desvalyl Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 914465-68-2

Mol F.

: C19H21N5O

Mol W.

: 335.4

Cat No.

: SA33311

Impurities, Valsartan

Valsartan EP Impurity A

Please enquire for price & pack size

Out of Stock

CAS No.

: 137862-87-4

Mol F.

: C24H29N5O3

Mol W.

: 435.22

Cat No.

: SA33307

Impurities, Valsartan

Valsartan EP Impurity B

Please enquire for price & pack size

Out of Stock

CAS No.

: 137863-20-8

Mol F.

: C30H33N5O3

Mol W.

: 511.61

Cat No.

: SA33309

Impurities, Valsartan

Valsartan EP Impurity C

Please enquire for price & pack size

Out of Stock

CAS No.

: 952652-79-8

Mol F.

: C23H27N5O3

Mol W.

: 421.49

Cat No.

: SA33308

Impurities, Valsartan

Valsartan EPImpurity E

Please enquire for price & pack size

Out of Stock

CAS No.

: 137863-17-3

Mol F.

: C24H29N5O3

Mol W.

: 435.52

Cat No.

: SA33310

Impurities, Valsartan

Valsartan Nitrile Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 443093-86-5

Mol F.

: C24H28N2O3

Mol W.

: 392.49

Cat No.

: SA33314

Impurities, Varenicline

Varenicline

Please enquire for price & pack size

Out of Stock

CAS No.

: 249296-44-4

Mol F.

: C13H13N3

Mol W.

: 211.26

Cat No.

: SA39500

Impurities, Varenicline

Varenicline Dioxo Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 357424-07-8

Mol F.

: C13H13N3O2

Mol W.

: 243.26

Cat No.

: SA39506

Impurities, Varenicline

Varenicline Hydroxy Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 357424-21-6

Mol F.

: C13H13N3O

Mol W.

: 227.26

Cat No.

: SA39507

Impurities, Varenicline

Varenicline Lactam

Please enquire for price & pack size

Out of Stock

CAS No.

: 873302-30-8

Mol F.

: CƒHNƒO

Mol W.

: 225.25

Cat No.

: SA39501

Impurities, Varenicline

Varenicline meta-Dinitro Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 853946-18-6

Mol F.

: C13H10F3N3O5

Mol W.

: 345.23

Cat No.

: SA39508

Impurities, Varenicline

Varenicline N-Formyl Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 796865-82-2

Mol F.

: C„HƒNƒO

Mol W.

: 239.27

Cat No.

: SA39505

Impurities, Varenicline

Varenicline N-Trifluoroacetyl Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 230615-70-0

Mol F.

: C…H‚FƒNƒO

Mol W.

: 307.27

Cat No.

: SA39504

Impurities, Varenicline

Varenicline ortho-Diamino Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 230615-69-7

Mol F.

: CƒH„FƒNƒO

Mol W.

: 285.26

Cat No.

: SA39503

Impurities, Varenicline

Varenicline ortho-Dinitro

Please enquire for price & pack size

Out of Stock

CAS No.

: 230615-59-5

Mol F.

: CƒH€FƒNƒO…

Mol W.

: 345.23

Cat No.

: SA39502

Impurities, Venlafaxine

Venlafaxine Acetamide Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 295366-48-2

Mol F.

: C17H25NO3

Mol W.

: 291.39

Cat No.

: SA22735

Impurities, Venlafaxine

Venlafaxine Desmethoxy

$395.00 25 mg

Out of Stock

CAS No.

: 93413-82-2

Mol F.

: C16H26ClNO

Mol W.

: 283.84

Cat No.

: SA22706

Impurities, Venlafaxine

Venlafaxine EP Impurity E

$95.00 25 mg

Out of Stock

CAS No.

: 93413-56-0; 93413-70-8

Mol F.

: C17H26ClNO2

Mol W.

: 311.85

Cat No.

: SA22708

Impurities, Venlafaxine

Venlafaxine N-Dimer

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C34H52N2O4

Mol W.

: 552.79

Cat No.

: SA22720

Impurities, Venlafaxine

Venlafaxine O-Desmethyl R-Isomer

$395.00 25 mg

Out of Stock

CAS No.

: 142761-11-3

Mol F.

: C16H25NO2

Mol W.

: 263.38

Cat No.

: SA22716

Impurities, Venlafaxine

Venlafaxine O-Desmethyl S-Isomer

$395.00 25 mg

Out of Stock

CAS No.

: 142761-12-4

Mol F.

: C16H25NO2

Mol W.

: 263.38

Cat No.

: SA22717

Impurities, Venlafaxine

Venlafaxine R-Isomer

$395.00 25 mg

Out of Stock

CAS No.

: 93413-46-8

Mol F.

: C17H27NO2

Mol W.

: 277.4

Cat No.

: SA22718

Impurities, Venlafaxine

Venlafaxine S-Isomer

$395.00 25 mg

Out of Stock

CAS No.

: 93413-44-6

Mol F.

: C17H27NO2

Mol W.

: 277.4

Cat No.

: SA22719

Impurities, Verapamil

Verapamil

Please enquire for price & pack size

Out of Stock

CAS No.

: 52-53-9

Mol F.

: C27H38N2O4

Mol W.

: 454.6

Cat No.

: SA32900

Impurities, Verapamil

Verapamil EP Impurity A

Please enquire for price & pack size

Out of Stock

CAS No.

: 63434-11-7

Mol F.

: C25H38N2O4

Mol W.

: 430.58

Cat No.

: SA32901

Impurities, Verapamil

Verapamil EP Impurity B

Please enquire for price & pack size

Out of Stock

CAS No.

: 3490-06-0

Mol F.

: C11H17NO2

Mol W.

: 195.26

Cat No.

: SA32902

Impurities, Verapamil

Verapamil EP Impurity C

Please enquire for price & pack size

Out of Stock

CAS No.

: 51012-67-0

Mol F.

: C12H19NO2

Mol W.

: 209.28

Cat No.

: SA32903

Impurities, Verapamil

Verapamil EP Impurity D

Please enquire for price & pack size

Out of Stock

CAS No.

: 36770-74-8

Mol F.

: C14H22ClNO2

Mol W.

: 271.77999999999997

Cat No.

: SA32904

Impurities, Verapamil

Verapamil EP Impurity E

Please enquire for price & pack size

Out of Stock

CAS No.

: 93-03-8

Mol F.

: C9H12O3

Mol W.

: 168.19

Cat No.

: SA32905

Impurities, Verapamil

Verapamil Ep Impurity F

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C17H26N2O2

Mol W.

: 290.4

Cat No.

: SA32906

Impurities, Verapamil

Verapamil EP Impurity G

Please enquire for price & pack size

Out of Stock

CAS No.

: 120-14-9

Mol F.

: C9H10O3

Mol W.

: 166.17

Cat No.

: SA32907

Impurities, Verapamil

Verapamil EP Impurity H

Please enquire for price & pack size

Out of Stock

CAS No.

: 190850-49-8

Mol F.

: C26H36N2O4

Mol W.

: 440.57

Cat No.

: SA32908

Impurities, Verapamil

Verapamil EP Impurity I

Please enquire for price & pack size

Out of Stock

CAS No.

: 2893-91-6

Mol F.

: C₂₆H₃₇ClN₂O₄

Mol W.

: 440.57

Cat No.

: SA32909

Impurities, Verapamil

Verapamil EP Impurity J

Please enquire for price & pack size

Out of Stock

CAS No.

: 67018-85-3

Mol F.

: C26H36N2O4

Mol W.

: 440.57

Cat No.

: SA32910

Impurities, Verapamil

Verapamil EP Impurity K

Please enquire for price & pack size

Out of Stock

CAS No.

: 20850-49-1

Mol F.

: C13H17NO2

Mol W.

: 219.28

Cat No.

: SA32911

Impurities, Verapamil

Verapamil EP Impurity L

Please enquire for price & pack size

Out of Stock

CAS No.

: 14046-55-0

Mol F.

: C12H16O3

Mol W.

: 208.25

Cat No.

: SA32912