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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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Impurities, Upadacitinib

Upadacitinib Pyrrolopyrazine Tosylate Dimer Impurity

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CAS No.

: NA

Mol F.

: C26H21N7O4S2

Mol W.

: 559.6

Cat No.

: SA52408

Impurities, Upadacitinib

Upadacitinib Pyrrolopyrazine Tosylate Impurity

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CAS No.

: NA

Mol F.

: C13H10BrN3O2S

Mol W.

: 352.2

Cat No.

: SA52401

Impurities, Upadacitinib

Upadacitinib Tert-butyl Carbamate Impurity | CAS : 1201187-44-1

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CAS No.

: 1201187-44-1

Mol F.

: C18H20N4O4S

Mol W.

: 388.4

Cat No.

: SA52426

Impurities, Ursodiol

Ursodiol

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CAS No.

: 128-13-2

Mol F.

: C24H40O4

Mol W.

: 392.57

Cat No.

: SA31204

Azacitidine, Impurities

USP Azacitidine Related Compound A

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CAS No.

: 931-86-2

Mol F.

: C3H4N4O

Mol W.

: 112.09

Cat No.

: SA37501

Azacitidine, Impurities

USP Azacitidine Related Compound B

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CAS No.

: 6974-32-9

Mol F.

: C28H24O9

Mol W.

: 504.48

Cat No.

: SA37502

Azacitidine, Impurities

USP Azacitidine Related Compound C

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CAS No.

: 2508-80-7

Mol F.

: C7H14N4O5

Mol W.

: 234.21

Cat No.

: SA37503

Carvedilol, Impurities

USP Carvedilol Related Compound F

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CAS No.

: 1246820-73-4

Mol F.

: C24H30N2O4

Mol W.

: 410.5

Cat No.

: SA31708

Cinacalcet, Impurities

USP Cinacalcet Related Compound A

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CAS No.

: 21172-43-0

Mol F.

: C11H13F3O3S

Mol W.

: 282.28

Cat No.

: SA34201

Cinacalcet, Impurities

USP Cinacalcet Related Compound B

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CAS No.

: 1271930-15-4

Mol F.

: C32H31F6N

Mol W.

: 543.59

Cat No.

: SA34210

Cinacalcet, Impurities

USP Cinacalcet Related Compound C

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CAS No.

: 1428185-71-0 (base); 1428118-39-1 (HCl)

Mol F.

: C22H23ClF3N

Mol W.

: 393.87

Cat No.

: SA34202

Cinacalcet, Impurities

USP Cinacalcet Related Compound E

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CAS No.

: 78573-45-2

Mol F.

: C10H11F3O

Mol W.

: 204.19

Cat No.

: SA34203

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, Impurities

USP Donepezil Alkene Pyridine N-Oxide

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CAS No.

: 896134-06-8

Mol F.

: C17H15NO4

Mol W.

: 297.31

Cat No.

: SA34321

Donepezil, Impurities

USP Donepezil Pyridine Analog

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CAS No.

: 4803-57-0

Mol F.

: C17H17NO3

Mol W.

: 283.32

Cat No.

: SA34322

Donepezil, Impurities

USP Donepezil Related Compound A

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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

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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

Impurities, Losartan

Valeric Acid

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CAS No.

: 109-52-4

Mol F.

: C5H10O2

Mol W.

: 102.13

Cat No.

: SA26716

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 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, 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.

: CƒHNƒO

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.

: C„HƒNƒO

Mol W.

: 239.27

Cat No.

: SA39505

Impurities, Varenicline

Varenicline N-Trifluoroacetyl Impurity

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CAS No.

: 230615-70-0

Mol F.

: C…H‚FƒNƒO

Mol W.

: 307.27

Cat No.

: SA39504

Impurities, Varenicline

Varenicline ortho-Diamino Impurity

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CAS No.

: 230615-69-7

Mol F.

: CƒH„FƒNƒO

Mol W.

: 285.26

Cat No.

: SA39503

Impurities, Varenicline

Varenicline ortho-Dinitro

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CAS No.

: 230615-59-5

Mol F.

: CƒH€FƒNƒO…

Mol W.

: 345.23

Cat No.

: SA39502

Impurities, Venlafaxine

Venlafaxine Acetamide Impurity

$1,555.00 100 mg

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CAS No.

: 295366-48-2

Mol F.

: C17H25NO3

Mol W.

: 291.39

Cat No.

: SA22735

Impurities, Venlafaxine

Venlafaxine Desmethoxy

$395.00 25 mg

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CAS No.

: 93413-82-2

Mol F.

: C16H26ClNO

Mol W.

: 283.84

Cat No.

: SA22706

Impurities, Venlafaxine

Venlafaxine N-Dimer

$2,555.00 100 mg

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CAS No.

Mol F.

: C34H52N2O4

Mol W.

: 552.79

Cat No.

: SA22720