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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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Decitabine, Impurities

USP Decitabine Related Compound A

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CAS No.

: 1207459-15-1

Mol F.

: C21H18Cl2O7

Mol W.

: 453.27

Cat No.

: SA42203

Decitabine, Impurities

USP Decitabine Related Compound B

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CAS No.

: 1034301-08-0

Mol F.

: C22H18Cl2N4O6

Mol W.

: 505.31

Cat No.

: SA42204

Decitabine, Impurities

USP Decitabine Related Compound C

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CAS No.

: 1140891-02-6

Mol F.

: C22H18Cl2N4O6

Mol W.

: 505.31

Cat No.

: SA42206

Diclofenac, Impurities

USP Diclofenac Related Compound A

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CAS No.

: 15362-40-0

Mol F.

: C₁₄H₉Cl₂NO

Mol W.

: 278.13

Cat No.

: SA12707

Donepezil

USP Donepezil Alkene Pyridine N-Oxide

$655.00 100 mg

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CAS No.

: 896134-06-8

Mol F.

: C17H15NO4

Mol W.

: 297.31

Cat No.

: SA34321

Impurities, Loratadine

USP Loratadine Related Compound C

$75.00 25 mg

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CAS No.

: 31251-41-9

Mol F.

: C14H10ClNO

Mol W.

: 243.69

Cat No.

: SA34002

Impurities, Nicardipine

USP Nicardipine Related Compound A

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CAS No.

: NA

Mol F.

: C16H16N2O6

Mol W.

: 332.31

Cat No.

: SA36201

Impurities, Nicardipine

USP Nicardipine Related Compound C

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CAS No.

: 21881-77-6

Mol F.

: C17H18N2O6

Mol W.

: 346.33

Cat No.

: SA36203

Impurities, Nicardipine

USP Nicardipine Related Compound D

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CAS No.

: 499-81-0

Mol F.

: C7H5NO4

Mol W.

: 167.12

Cat No.

: SA36210

Valacyclovir

Valaciclovir EP Impurity N

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CAS No.

: 2519847-26-6

Mol F.

: C19H25N11O5

Mol W.

: 487.5

Cat No.

: SA49508

Valacyclovir

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CAS No.

: 124832-26-4; 124832-27-5 (HCl salt)

Mol F.

: C13H20N6O4

Mol W.

: 324.3

Cat No.

: SA49500

Impurities, Valacyclovir

Valacyclovir Related Compound D

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CAS No.

: 1346747-69-0

Mol F.

: C15H24N6O4

Mol W.

: 352.39

Cat No.

: SA49507

Impurities, Losartan

Valeric Acid

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CAS No.

: 109-52-4

Mol F.

: C5H10O2

Mol W.

: 102.13

Cat No.

: SA26716

Fluvoxamine

Valerophenone

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CAS No.

: 1009-14-9

Mol F.

: C11H14O

Mol W.

: 162.2

Cat No.

: SA63515

Ganciclovir, Impurities

Valganciclovir Hydrochloride

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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

$695.00 500 mg

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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

$995.00 100 mg

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CAS No.

: 1353844-77-5

Mol F.

: C34H31N3O2

Mol W.

: 513.6

Cat No.

: SA33321

Impurities, Valsartan

Valsartan De-oxopentyl Methyl Ester

$995.00 500 mg

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CAS No.

: 1111177-20-8

Mol F.

: C20H22N2O2

Mol W.

: 322.4

Cat No.

: SA33303

Impurities, Valsartan

Valsartan Descarboxylic acid

$1,495.00 500 mg

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CAS No.

: 1314799-74-0

Mol F.

: C23H29N5O

Mol W.

: 391.51

Cat No.

: SA33300

Impurities, Valsartan

Valsartan Descarboxylic acid diazirine impurity

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CAS No.

Mol F.

: C23H29N3O

Mol W.

: 363.49

Cat No.

: SA33301

Impurities, Valsartan

Valsartan Desvaleryl Impurity

$995.00 500 mg

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CAS No.

: 676129-92-3

Mol F.

: C19H21N5O2

Mol W.

: 351.4

Cat No.

: SA33302

Impurities, Valsartan

Valsartan Desvaleryl Nitrile Impurity

$655.00 500 mg

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CAS No.

: 1071286-94-6

Mol F.

: C19H20N2O2

Mol W.

: 308.37

Cat No.

: SA33313

Impurities, Valsartan

Valsartan Desvalyl Impurity

$655.00 500 mg

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CAS No.

: 914465-68-2

Mol F.

: C19H21N5O

Mol W.

: 335.4

Cat No.

: SA33311

Impurities, Valsartan

Valsartan EP Impurity A

$695.00 500 mg

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CAS No.

: 137862-87-4

Mol F.

: C24H29N5O3

Mol W.

: 435.22

Cat No.

: SA33307

Impurities, Valsartan

Valsartan EP Impurity B

$655.00 500 mg

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CAS No.

: 137863-20-8

Mol F.

: C30H33N5O3

Mol W.

: 511.61

Cat No.

: SA33309

Impurities, Valsartan

Valsartan EP Impurity C

$655.00 500 mg

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CAS No.

: 952652-79-8

Mol F.

: C23H27N5O3

Mol W.

: 421.49

Cat No.

: SA33308

Impurities, Valsartan

Valsartan EPImpurity E

$155.00 100 mg

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CAS No.

: 137863-17-3

Mol F.

: C24H29N5O3

Mol W.

: 435.52

Cat No.

: SA33310

Impurities, Valsartan

Valsartan N-Propanoyl Analog impurity

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CAS No.

: 1332623-79-6

Mol F.

: C22H25N5O3

Mol W.

: 407.5

Cat No.

: SA33322

Impurities, Valsartan

Valsartan Nitrile Impurity

$995.00 500 mg

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CAS No.

: 443093-86-5

Mol F.

: C24H28N2O3

Mol W.

: 392.49

Cat No.

: SA33314

Impurities, Valsartan

Valsartan Tetrazolyl Biphenyl Dimer Acid Impurity

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CAS No.

: 1353844-75-3

Mol F.

: C33H31N9O2

Mol W.

: 585.67

Cat No.

: SA33325

Impurities, Valsartan

Valsartan tetrazolyl Biphenyl Dimer Methyl Ester

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CAS No.

: NA

Mol F.

: C34H33N9O2

Mol W.

: 599.7

Cat No.

: SA33324

Vardenafil

Vardenafil Carboxylic Acid Impurity

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CAS No.

: 358390-39-3

Mol F.

: C18H20N4O4

Mol W.

: 356.4

Cat No.

: SA79011

Vardenafil

Vardenafil Chlorosulfone Impurity

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CAS No.

: 224789-26-8

Mol F.

: C17H19CIN4O4S

Mol W.

: 410.9

Cat No.

: SA79012

Vardenafil

Vardenafil Dessulfonyl Impurity

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CAS No.

: 224789-21-3

Mol F.

: C17H20N4O2

Mol W.

: 312.4

Cat No.

: SA79003

Vardenafil

Vardenafil EP Impurity A

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CAS No.

: 2169247-39-4

Mol F.

: C21H28N6O4S

Mol W.

: 460.6

Cat No.

: SA79004

Vardenafil

Vardenafil EP Impurity B

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CAS No.

: 437717-43-6

Mol F.

: C17H20N4O5S

Mol W.

: 392.4

Cat No.

: SA79005

Vardenafil

Vardenafil EP Impurity C

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CAS No.

: 1255919-03-9

Mol F.

: C38H46N10O8S2

Mol W.

: 834.9

Cat No.

: SA79006

Vardenafil

Vardenafil HCl

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CAS No.

: 224785-91-5

Mol F.

: C23H32N6O4S : HCl

Mol W.

: 488.6 : 36.5

Cat No.

: SA79000

Vardenafil

Vardenafil Hydroxy Impurity

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CAS No.

: 224785-98-2

Mol F.

: C23H32N6O5S

Mol W.

: 504.6

Cat No.

: SA79014

Vardenafil

Vardenafil Hydroxy Thione Impurity

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CAS No.

: 912576-30-8

Mol F.

: C23H32N6O4S2

Mol W.

: 520.7

Cat No.

: SA79015

Vardenafil

Vardenafil Oxopiperazine

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CAS No.

: 448184-58-5

Mol F.

: C21H26N6O5S

Mol W.

: 474.5

Cat No.

: SA79016

Vardenafil

Vardenafil Related Compound E

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CAS No.

: 448184-46-1

Mol F.

: C21H28N6O4S

Mol W.

: 460.6

Cat No.

: SA79007

Vardenafil

Vardenafil USP Related Compound D

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CAS No.

: 448184-48-3

Mol F.

: C23H32N6O5S

Mol W.

: 504.6

Cat No.

: SA79008

Impurities, Varenicline

Varenicline

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CAS No.

: 249296-44-4

Mol F.

: C13H13N3

Mol W.

: 211.26

Cat No.

: SA39500

Impurities, Varenicline

Varenicline Dioxo Impurity

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CAS No.

: 357424-07-8

Mol F.

: C13H13N3O2

Mol W.

: 243.26

Cat No.

: SA39506

Impurities, Varenicline

Varenicline Hydroxy Impurity

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CAS No.

: 357424-21-6

Mol F.

: C13H13N3O

Mol W.

: 227.26

Cat No.

: SA39507

Impurities, Varenicline

Varenicline Lactam

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CAS No.

: 873302-30-8

Mol F.

: C13H11N3O

Mol W.

: 225.25

Cat No.

: SA39501

Impurities, Varenicline

Varenicline meta-Dinitro Impurity

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CAS No.

: 853946-18-6

Mol F.

: C13H10F3N3O5

Mol W.

: 345.23

Cat No.

: SA39508

Impurities, Varenicline

Varenicline N-Formyl Impurity

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CAS No.

: 796865-82-2

Mol F.

: C14H13N3O

Mol W.

: 239.27

Cat No.

: SA39505

Impurities, Varenicline

Varenicline N-Trifluoroacetyl Impurity

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CAS No.

: 230615-70-0

Mol F.

: C15H12F3N3O

Mol W.

: 307.27

Cat No.

: SA39504