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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, Prednisolone

Prednisolone-21-ethylcarbonate

$195.00 25 mg

In Stock

CAS No.

: 2205-88-1

Mol F.

: C24H32O7

Mol W.

: 432.5

Cat No.

: SA16704

Impurities, Prednisolone

Prednisolone-21-formiate Impurity | CAS : 2141-22-2

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In Stock

CAS No.

: 2141-22-2

Mol F.

: C22H28O6

Mol W.

: 388.46

Cat No.

: SA16721

Impurities, Prednisolone

Prednisolone-21-Valarate

$175.00 25 mg

In Stock

CAS No.

: 39791-31-6

Mol F.

: C26H36O6

Mol W.

: 444.56

Cat No.

: SA16715

Impurities, Prednisone

Prednisone

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In Stock

CAS No.

: 53-03-2

Mol F.

: C21H26O5

Mol W.

: 358.43

Cat No.

: SA26200

Impurities, Prednisone

Prednisone 21-Acetate

$95.00 25 mg

In Stock

CAS No.

: 125-10-0

Mol F.

: C23H28O6

Mol W.

: 400.46

Cat No.

: SA26203

Impurities, Prednisone

Prednisone 21-Aldehyde

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In Stock

CAS No.

: 70522-55-3

Mol F.

: C21H24O5

Mol W.

: 356.41

Cat No.

: SA26202

Impurities, Prednisone

Prednisone EP Impurity K

Please enquire for price & pack size

In Stock

CAS No.

: 7738-93-4

Mol F.

: C19H22O3

Mol W.

: 298.38

Cat No.

: SA26219

Pregabalin

Pregabalin Dimer Impurity; Pregabalin Lactam Dimer

$395.00 25 mg

In Stock

CAS No.

: 2361911-35-3

Mol F.

: C17H30N2O2

Mol W.

: 294.4

Cat No.

: SA24844

Pregabalin

Pregabalin EP Impurity B; (R)-Pregabalin

$125.00 25 mg

In Stock

CAS No.

: 148553-51-9

Mol F.

: C8H17NO2

Mol W.

: 159.23

Cat No.

: SA24802

Pregabalin

Pregabalin EP Impurity D; Isopropyl DL-Mandelate

$95.00 25 mg

In Stock

CAS No.

: 4118-51-8

Mol F.

: C11H14O3

Mol W.

: 194.23

Cat No.

: SA24837

Pregabalin

Pregabalin Impurity C

$95.00 25 mg

In Stock

CAS No.

: 90-64-2

Mol F.

: C₈H₈O₃

Mol W.

: 152.15

Cat No.

: SA24840

Pregabalin

Pregabalin Lactam Impurity; Pregabalin Related Compound C

$90.00 25 mg

In Stock

CAS No.

: 61312-87-6

Mol F.

: C8H15NO

Mol W.

: 141.21

Cat No.

: SA24800

Pregabalin

Pregabalin Racemate

$95.00 25 mg

In Stock

CAS No.

: 128013-69-4

Mol F.

: C8H17NO2

Mol W.

: 159.23

Cat No.

: SA24801

Impurities, Primidone

Primidone Impurity A

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In Stock

CAS No.

: 7206-76-0

Mol F.

: C11H14N2O2

Mol W.

: 206.24

Cat No.

: SA20601

Impurities, Primidone

Primidone Impurity B

Please enquire for price & pack size

In Stock

CAS No.

: 50-06-6

Mol F.

: C12H12N2O3

Mol W.

: 232.1

Cat No.

: SA20602

Impurities, Primidone

Primidone Impurity C

Please enquire for price & pack size

In Stock

CAS No.

: 90-26-6

Mol F.

: C10H13NO

Mol W.

: 163.226

Cat No.

: SA20603

Impurities, Primidone

Primidone Impurity D

Please enquire for price & pack size

In Stock

CAS No.

: 80544-75-8

Mol F.

: C11H12N2O

Mol W.

: 188.22

Cat No.

: SA20604

Impurities, Primidone

Primidone Impurity E

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In Stock

CAS No.

: 90-27-7

Mol F.

: C10H12O2

Mol W.

: 164.204

Cat No.

: SA20605

Impurities, Primidone

Primidone Impurity F

Please enquire for price & pack size

In Stock

CAS No.

: 1189504-46-8

Mol F.

: C21H24N2O2

Mol W.

: 336.43

Cat No.

: SA20606

Chlorpromazine, Impurities

Prochlorperazine

$155.00 25 mg

In Stock

CAS No.

: 58-38-8

Mol F.

: C20H24ClN3S

Mol W.

: 373.94

Cat No.

: SA21616

Impurities, Progesterone

Progesterone EP Impurity B

Please enquire for price & pack size

In Stock

CAS No.

: 145-14-2

Mol F.

: C21H32O2

Mol W.

: 316.48

Cat No.

: SA18001

Progesterone

Progesterone EP Impurity C

Please enquire for price & pack size

In Stock

CAS No.

: 145-15-3

Mol F.

: C21H32O2

Mol W.

: 316.48

Cat No.

: SA18002

Impurities, Progesterone

Progesterone EP Impurity D

Please enquire for price & pack size

In Stock

CAS No.

: 5035-09-6

Mol F.

: C23H34O3

Mol W.

: 358.51

Cat No.

: SA18003

Progesterone

Progesterone EP Impurity E

Please enquire for price & pack size

In Stock

CAS No.

: 5062-62-4

Mol F.

: C23H34O3

Mol W.

: 358.51

Cat No.

: SA18004

Impurities, Progesterone

Progesterone EP Impurity F

Please enquire for price & pack size

In Stock

CAS No.

: 2257421-78-4

Mol F.

: C27H38O2

Mol W.

: 394.59

Cat No.

: SA18015

Impurities, Progesterone

Progesterone EP Impurity H

Please enquire for price & pack size

In Stock

CAS No.

: 1162-56-7

Mol F.

: C21H28O2

Mol W.

: 312.44

Cat No.

: SA18006

Impurities, Progesterone

Progesterone EP Impurity J

Please enquire for price & pack size

In Stock

CAS No.

: 1162-54-5

Mol F.

: C21H28O2

Mol W.

: 312.44

Cat No.

: SA18008

Progesterone

Progesterone EP Impurity K

Please enquire for price & pack size

In Stock

CAS No.

: 17652-16-3

Mol F.

: C21H28O2

Mol W.

: 312.44

Cat No.

: SA18009

Progesterone

Progesterone EP Impurity M

Please enquire for price & pack size

In Stock

CAS No.

: 2000-66-0

Mol F.

: C21H30O2

Mol W.

: 314.46

Cat No.

: SA18011

Propranolol

Propranolol Beta Naphthol Epoxide Impurity

$265.00 100 mg

In Stock

CAS No.

Mol F.

: C13H12O2

Mol W.

: 200.23

Cat No.

: SA24616

Propranolol

Propranolol Chloro impurity

$195.00 100 mg

In Stock

CAS No.

: 112805-69-3

Mol F.

: C13H13ClO2

Mol W.

: 236.69

Cat No.

: SA24601

Propranolol

Propranolol EP Impurity A

$160.00 50 mg

In Stock

CAS No.

: 36112-95-5

Mol F.

: C13H14O3

Mol W.

: 218.25

Cat No.

: SA24603

Propranolol

Propranolol EP Impurity B

$255.00 50 mg

In Stock

CAS No.

: 83314-78-7

Mol F.

: C29H33NO4

Mol W.

: 459.57

Cat No.

: SA24602

Propranolol

Propranolol EP Impurity C

$155.00 50 mg

In Stock

CAS No.

: 17216-10-3

Mol F.

: C23H20O3

Mol W.

: 344.4

Cat No.

: SA24600

Propranolol

Propranolol Epoxide impurity

$195.00 1 g

In Stock

CAS No.

: 2461-42-9

Mol F.

: C13H12O2

Mol W.

: 200.23

Cat No.

: SA24609

Propranolol

Propranolol ethyl Amine Impurity

$225.00 50 mg

In Stock

CAS No.

Mol F.

: C15H19NO2

Mol W.

: 245.32

Cat No.

: SA24612

Impurities, Naltrexone

Pseudonaltrexone; Naltrexone dimer

Please enquire for price & pack size

In Stock

CAS No.

: 607732-61-6

Mol F.

: C40H44N2O8

Mol W.

: 680.79

Cat No.

: SA47801

Impurities, Tiotropium

Pseudoscopine

$350.00 25 mg

In Stock

CAS No.

: 498-45-3

Mol F.

: C8H13NO2

Mol W.

: 155.19

Cat No.

: SA11716

Emtricitabine, Impurities

Pyrimidinedione analog; Emtricitabine 5-fluorouracil

$295.00 25 mg

In Stock

CAS No.

: 145986-11-4

Mol F.

: C₈H₉FN₂O₄S

Mol W.

: 248.23

Cat No.

: SA22907

Brimonidine, Impurities

Quinoxaline 6-Isothiocyanate

$350.00 25 mg

In Stock

CAS No.

: 135306-56-8

Mol F.

: C9H5N3S

Mol W.

: 187.22

Cat No.

: SA20724

Empagliflozin, Impurities

R-Isomer Side chain of Empagliflozin

Please enquire for price & pack size

In Stock

CAS No.

: 2194590-02-6

Mol F.

: C17H16ClIO2

Mol W.

: 414.67

Cat No.

: SA15144

Bupropion, Impurities

rac erythro-Dihydro Bupropion

$125.00 25 mg

In Stock

CAS No.

: 99102-04-2

Mol F.

: C13H20ClNO

Mol W.

: 241.76

Cat No.

: SA12202

Impurities, Venlafaxine

rac N-Desmethyl Venlafaxine

Please enquire for price & pack size

In Stock

CAS No.

: 149289-30-5

Mol F.

: C16H25NO2

Mol W.

: 263.37

Cat No.

: SA22725

Bupropion, Impurities

rac threo-Dihydro Bupropion

$125.00 25 mg

In Stock

CAS No.

: 92264-82-9

Mol F.

: C13H20ClNO

Mol W.

: 241.76

Cat No.

: SA12201

Brivaracetam, Impurities

rac-Brivaracetam

$195.00 25 mg

In Stock

CAS No.

: 357335-87-6

Mol F.

: C11H20N2O2

Mol W.

: 212.3

Cat No.

: SA47301

Efavirenz, Impurities

Rac-Efavirenz

Please enquire for price & pack size

In Stock

CAS No.

: 177530-93-7

Mol F.

: C14H9ClF3NO2

Mol W.

: 315.67

Cat No.

: SA17601

Impurities, Praziquantel

rac-hydroxy praziquantle Impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C19H24N2O3

Mol W.

: 328.4

Cat No.

: SA13909

Ibrutinib, Impurities

rac-N-Desacryloyl N-Propionyl Ibrutinib

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C25H26N6O2

Mol W.

: 422.51

Cat No.

: SA47410

Impurities, Raloxifene

Raloxifene 4′-Ethoxy Analog

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C30H31NO4S

Mol W.

: 501.64

Cat No.

: SA24918

Impurities, Raloxifene

Raloxifene 6-Ethoxy Analog

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C30H31NO4S

Mol W.

: 501.64

Cat No.

: SA24919