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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, Nitrosamine

rac 1-Nitroso-2-methylindoline

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CAS No.

: 85440-79-5

Mol F.

: C9H10N2O

Mol W.

: 162.19

Cat No.

: SA44640

Atomoxetine, Impurities

rac 3-Chloro-1-phenyl-1-(2-methylphenoxy)propane

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CAS No.

: 881995-47-7

Mol F.

: C16H17ClO

Mol W.

: 260.76

Cat No.

: SA22122

Impurities, Pregabalin

rac 4,5-Dehydro Pregabalin

$250.00 25 mg

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CAS No.

: 216576-74-8

Mol F.

: C8H15NO2

Mol W.

: 157.21

Cat No.

: SA24804

Impurities, Pregabalin

rac 5,6-Dehydro Pregabalin

$995.00 25 mg

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CAS No.

: 1136478-30-2

Mol F.

: C8H15NO2

Mol W.

: 157.21

Cat No.

: SA24805

Impurities, Propranolol

rac 7-Methoxy Propranolol

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CAS No.

: 76275-53-1

Mol F.

: C17H23NO3

Mol W.

: 289.37

Cat No.

: SA24607

Efavirenz, Impurities

Rac Efavirenz Benzoyl Amino Alcohol (USP)

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CAS No.

: 1189491-03-9

Mol F.

: C21H17ClF3NO3

Mol W.

: 423.81

Cat No.

: SA17602

Efavirenz, Impurities

rac Methyl Efavirenz

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CAS No.

: 353270-76-5

Mol F.

: C₁₅H₁₁ClF₃NO₂

Mol W.

: 329.7

Cat No.

: SA17609

Impurities, Nebivolol

rac N-Benzyl Nebivolol

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CAS No.

: 929706-85-4

Mol F.

: C29H31F2NO4

Mol W.

: 495.56

Cat No.

: SA14705

Impurities, Venlafaxine

rac N-Boc-N,O-Didesmethyl Venlafaxine 2,3,4-Tri-O-acetyl-β-D-glucuronide Methyl Este

$2,555.00 50 mg

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CAS No.

Mol F.

: C33H47NO13

Mol W.

: 665.72

Cat No.

: SA22722

Impurities, Venlafaxine

rac N-Desmethyl-N-(4-methoxyphenethyl) Venlafaxine

$895.00 50 mg

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CAS No.

: 1346601-14-6

Mol F.

: C25H35NO3

Mol W.

: 397.55

Cat No.

: SA22724

Dapoxetine, Impurities

rac N-Didemethyl Dapoxetine

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CAS No.

: 119357-34-5

Mol F.

Mol W.

: C19H19NO

Cat No.

: SA23011

Atomoxetine, Impurities

rac N-Methyl Atomoxetine Oxalate

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CAS No.

: 107688-86-8

Mol F.

: C18H23NO.C2H2O4

Mol W.

: 269.38/90.03

Cat No.

: SA22118

Impurities, Venlafaxine

rac N,N-Didesmethyl-N-(4-hydroxyphenethyl)-O-desmethyl Venlafaxine

$1,555.00 100 mg

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CAS No.

: 1346601-21-5

Mol F.

: C22H29NO3

Mol W.

: 355.47

Cat No.

: SA22727

Impurities, Venlafaxine

rac N,N-Didesmethyl-O-desmethyl Venlafaxine 2,3,4-Tri-O-acetyl-β-D-glucuronide Methyl Este

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CAS No.

Mol F.

: C27H37NO11

Mol W.

: 551.58

Cat No.

: SA22732

Impurities, Nebivolol

rac Nebivolol Hydrochloride

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CAS No.

: 169293-50-9

Mol F.

: C22H26ClF2NO4

Mol W.

: 441.9

Cat No.

: SA14704

Carbamazepine, Impurities

rac trans-10,11-Dihydro-10,11-dihydroxy Carbamazepine

$395.00 25 mg

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CAS No.

: 58955-93-4

Mol F.

: C15H14N2O3

Mol W.

: 270.28

Cat No.

: SA20318

Impurities, Praziquantel

rac-1,2,3,6,7,11b-Hexahydro-2-[(4-oxocyclohexyl)carbonyl]-4H-pyrazino[2,1-a]isoquinolin-4-one

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CAS No.

: 57452-32-1

Mol F.

: C19H22N2O3

Mol W.

: 326.39

Cat No.

: SA13904

Impurities, Nicotine

rac-2-Amino Nicotine

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CAS No.

: 32726-84-4

Mol F.

: C₁₀H₁₅N₃

Mol W.

: 177.25

Cat No.

: SA32209

Impurities, Pregabalin

rac-4-Methyl-pregabalin

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CAS No.

: 313651-23-9

Mol F.

: C9H19NO2

Mol W.

: 173.25

Cat No.

: SA24816

Bromhexine, Impurities

rac-cis-Ambroxol

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CAS No.

: 107814-37-9

Mol F.

: C13H18Br2N2O

Mol W.

: 378.10

Cat No.

: SA28407

Dorzolamide, Impurities

rac-Dorzolamide

$255.00 25 mg

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CAS No.

: 120280-13-9

Mol F.

: C10H16N2O4S3

Mol W.

: 324.44

Cat No.

: SA24117

Impurities, Praziquantel

rac-Praziquanamine

$120.00 25 mg

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CAS No.

: 61196-37-0

Mol F.

: C12H14N2O

Mol W.

: 202.25

Cat No.

: SA13907

Impurities, Pregabalin

rac-Pregabalin N-Acrylamide

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CAS No.

: 1495844-28-4

Mol F.

: C11H19NO3

Mol W.

: 213.27

Cat No.

: SA24819

Dorzolamide, Impurities

rac-trans Dorzolamide Hydrochloride

$255.00 25 mg

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CAS No.

: 120279-36-9

Mol F.

: C10H17ClN2O4S3

Mol W.

: 360.9

Cat No.

: SA24119

Impurities, Pitavastatin

Racemic pitvastatin

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CAS No.

: NA

Mol F.

: C25H23FNO4- .1/2Ca+2

Mol W.

: 420.45. 20

Cat No.

: SA29521

Impurities, Raloxifene

Raloxifene 4-Monomethyl Ether

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CAS No.

: 185415-07-0

Mol F.

: C29H299NO4S

Mol W.

: 487.61

Cat No.

: SA24904

Impurities, Raloxifene

Raloxifene 6-Monomethyl Ether; 6-methoxy benzothiophene impurity

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CAS No.

: 178451-13-3

Mol F.

: C29H299NO4S

Mol W.

: 487.61

Cat No.

: SA24903

Impurities, Raloxifene

Raloxifene Benzoic Acid Impurity

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CAS No.

: 84449-80-9

Mol F.

: C14H20ClNO3

Mol W.

: 285.77

Cat No.

: SA24920

Impurities, Raloxifene

Raloxifene Dimer

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CAS No.

: 618902-12-8

Mol F.

: C56H52N2O8S2

Mol W.

: 945.15

Cat No.

: SA24905

Impurities, Raltegravir

Raltegravir (E/Z Mixture)-ethoxyacethydrazone

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CAS No.

: NA

Mol F.

: C22H27FN6O6

Mol W.

: 490.48

Cat No.

: SA25618

Raltegravir

Raltegravir EP Impurity A

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CAS No.

: 518048-03-8

Mol F.

: C16H19FN4O3

Mol W.

: 334.35

Cat No.

: SA25600

Impurities, Raltegravir

Raltegravir EP Impurity B

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CAS No.

: 1193687-85-2

Mol F.

: C19H24FN5O3

Mol W.

: 389.42

Cat No.

: SA25601

Impurities, Raltegravir

Raltegravir EP Impurity C

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CAS No.

: 1391918-17-4

Mol F.

: C20H23FN6O6

Mol W.

: 462.44

Cat No.

: SA25602

Impurities, Raltegravir

Raltegravir EP Impurity D

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CAS No.

: 1064706-98-4

Mol F.

: C18H19FN4O6

Mol W.

: 406.37

Cat No.

: SA25603

Impurities, Raltegravir

Raltegravir EP Impurity E

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CAS No.

: 1193687-87-4

Mol F.

: C20H22N6O5

Mol W.

: 426.43

Cat No.

: SA25604

Impurities, Raltegravir

Raltegravir EP Impurity F

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CAS No.

: 2138805-56-6(Z/E)

Mol F.

: C22H27FN6O6

Mol W.

: 490.48

Cat No.

: SA25605

Impurities, Raltegravir

Raltegravir EP Impurity G

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CAS No.

: NA

Mol F.

: C22H27FN6O6

Mol W.

: 490.48

Cat No.

: SA25606

Impurities, Raltegravir

Raltegravir EP Impurity H

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CAS No.

: 1391918-18-5

Mol F.

: C34H36F2N8O8

Mol W.

: 722.69

Cat No.

: SA25607

Impurities, Raltegravir

Raltegravir Impurity SA25612

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CAS No.

: 1159977-42-0

Mol F.

: C18H21N3O6

Mol W.

: 375.38

Cat No.

: SA25612

Impurities, Raltegravir

Raltegravir Impurity SA25614

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CAS No.

: 519032-08-7

Mol F.

: C17H19N3O6

Mol W.

: 361.35

Cat No.

: SA25614

Impurities, Raltegravir

Raltegravir Impurity SA25615

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CAS No.

: 888504-27-6

Mol F.

: C18H21N3O6

Mol W.

: 375.38

Cat No.

: SA25615

Impurities, Raltegravir

Raltegravir Impurity SA25617

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CAS No.

: 1172131-64-4

Mol F.

: C21H27FN4O4

Mol W.

: 418.46

Cat No.

: SA25617

Impurities, Ramipril

Ramipril

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CAS No.

: 87333-19-5

Mol F.

: C23H32N2O5

Mol W.

: 416.51

Cat No.

: SA31300

Impurities, Ramipril

Ramipril Bicyclic Acid

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CAS No.

: 80875-98-5

Mol F.

: C8H13NO2

Mol W.

: 155.19

Cat No.

: SA31316

Impurities, Ramipril

Ramipril Bicyclic Acid Benzyl Ester (HCl Salt)

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CAS No.

: 87269-87-2

Mol F.

: C15H20ClNO2

Mol W.

: 281.78

Cat No.

: SA31317

Impurities, Ramipril

Ramipril EP Impurity A

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CAS No.

: 108313-11-7

Mol F.

: C22H30N2O5

Mol W.

: 402.48

Cat No.

: SA31301

Impurities, Ramipril

Ramipril EP Impurity B

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CAS No.

: 295328-72-2

Mol F.

: C24H34N2O5

Mol W.

: 430.54

Cat No.

: SA31302

Impurities, Ramipril

Ramipril EP Impurity C

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CAS No.

: 99742-35-5

Mol F.

: C23H39ClN2O5

Mol W.

: 459.02

Cat No.

: SA31303

Impurities, Ramipril

Ramipril EP Impurity D

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CAS No.

: 108731-95-9

Mol F.

: C23H30N2O4

Mol W.

: 398.5

Cat No.

: SA31304

Impurities, Ramipril

Ramipril EP Impurity E

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CAS No.

: 87269-97-4

Mol F.

: C21H28N2O5

Mol W.

: 388.46

Cat No.

: SA31305