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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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Azithromycin, Impurities

Azithromycin Impurity J

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In Stock

CAS No.

: 117693-41-1

Mol F.

: C30H58N2O9

Mol W.

: 590.79

Cat No.

: SA10304

Beclomethasone Dipropionate, Impurities

Beclomethasone

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In Stock

CAS No.

Mol F.

: C22H29ClO5

Mol W.

: 408.93

Cat No.

: SA15604

Beclomethasone Dipropionate

Beclomethasone 11,17,21-Tripropionate

$355.00 25 mg

In Stock

CAS No.

: 1709825-83-1

Mol F.

: C31H41ClO8

Mol W.

: 577.11

Cat No.

: SA15619

Beclomethasone Dipropionate

Beclomethasone 17-Propionate

$155.00 25 mg

In Stock

CAS No.

: 5534-18-9

Mol F.

: C25H33ClO6

Mol W.

: 464.98

Cat No.

: SA15603

Beclomethasone Dipropionate

Beclomethasone 21-Acetate 17-Propionate

$195.00 25 mg

In Stock

CAS No.

: 5534-13-4

Mol F.

: C27H35ClO7

Mol W.

: 507.02

Cat No.

: SA15610

Beclomethasone Dipropionate

Beclomethasone 21-Butyrate 17-Propionate

$295.00 25 mg

In Stock

CAS No.

Mol F.

: C29H39ClO7

Mol W.

: 535.07

Cat No.

: SA15611

Beclomethasone Dipropionate

Beclomethasone 21-Propionate

$155.00 25 mg

In Stock

CAS No.

: 69224-79-9

Mol F.

: C25H33ClO6

Mol W.

: 464.98

Cat No.

: SA15602

Beclomethasone Dipropionate, Impurities

Beclomethasone Dipropinate EP Impurity J; Betamethasone 9,11-Epoxide 17,21-Dipropionate

$195.00 25 mg

In Stock

CAS No.

: 66917-44-0

Mol F.

: C28H36O7

Mol W.

: 484.58

Cat No.

: SA15615

Beclomethasone Dipropionate

Beclomethasone Dipropinate Impurity I

$255.00 25 mg

In Stock

CAS No.

Mol F.

: C28H36O6

Mol W.

: 468.6

Cat No.

: SA15614

Benazepril, Impurities

Benazepril

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In Stock

CAS No.

: 86541-74-4

Mol F.

: C24H28N2O5

Mol W.

: 424.49

Cat No.

: SA29600

Benazepril, Impurities

Benazepril EP Impurity A

$295.00 25 mg

In Stock

CAS No.

: 215447-89-5; 131064-75-0

Mol F.

: C24H28N2O5

Mol W.

: 424.49

Cat No.

: SA29601

Benazepril, Impurities

Benazepril EP Impurity B

$395.00 25 mg

In Stock

CAS No.

: 88372-39-8; 86499-30-1; 98626-50-7

Mol F.

: C24H28N2O5

Mol W.

: 424.49

Cat No.

: SA29602

Benazepril, Impurities

Benazepril EP Impurity C

$275.00 25 mg

In Stock

CAS No.

: 86541-78-8

Mol F.

: C₂₂H₂₄N₂O₅

Mol W.

: 396.44

Cat No.

: SA29603

Benazepril, Impurities

Benazepril EP Impurity E

$150.00 25 mg

In Stock

CAS No.

: 88372-47-8

Mol F.

: C12H14N2O3

Mol W.

: 234.25

Cat No.

: SA29605

Benazepril, Impurities

Benazepril EP Impurity F

$95.00 25 mg

In Stock

CAS No.

: 109010-60-8

Mol F.

: C16H22N2O3

Mol W.

: 290.36

Cat No.

: SA29606

Benazepril, Impurities

Benazepril EP Impurity G

$195.00 25 mg

In Stock

CAS No.

: 103129-58-4

Mol F.

: C26H32N2O5

Mol W.

: 452.54

Cat No.

: SA29607

Impurities, Nortropine

Benzilic acid isopropyl ester Impurity

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In Stock

CAS No.

Mol F.

: C17H18O3

Mol W.

: 270.32

Cat No.

: SA46600

Impurities, Ticagrelor

Benzyl ((3aS,4R,6S,6aR)-6-hydroxy-2,2-dimethyltetrahydro-3aH-cyclopenta[d][1,3]dioxol-4-yl)carbamate (TGA-1)

$155.00 100 mg

In Stock

CAS No.

: 274693-53-7

Mol F.

: C16H21NO5

Mol W.

: 307.34

Cat No.

: SA32509

Impurities, Ticagrelor

Benzyl (3aS,4R,6S,6aR)-6-(2-hydroxyethoxy)-2,2-dimethyl-tetrahydro-3aH-cyclopenta[d][1,3]dioxol-4-ylcarbamate

$195.00 100 mg

In Stock

CAS No.

: 274693-54-8

Mol F.

: C18H25NO6

Mol W.

: 351.39

Cat No.

: SA32512

Famciclovir, Impurities

Benzyl triethyl ammonium chloride

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In Stock

CAS No.

: 56-37-1

Mol F.

: C13H22ClN

Mol W.

: 227.77

Cat No.

: SA48302

Impurities, Neomycin

Benzylidene Ribosylparomamine Derivative

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In Stock

CAS No.

Mol F.

: C24H37N3O11

Mol W.

: 543.56

Cat No.

: SA51409

Beclomethasone Dipropionate, Impurities

Betamethasone 9,11-Epoxide 17-Propionate

$195.00 25 mg

In Stock

CAS No.

: 79578-39-5

Mol F.

: C25H32O6

Mol W.

: 428.52

Cat No.

: SA15620

Beclomethasone Dipropionate, Impurities

Betamethasone 9,11-Epoxide 21-Propionate

$195.00 25 mg

In Stock

CAS No.

: 205105-83-5

Mol F.

: C25H32O6

Mol W.

: 428.52

Cat No.

: SA15612

Betamethasone, Impurities

Betamethasone Acetate Related Compound D

$125.00 25 mg

In Stock

CAS No.

: 912-38-9

Mol F.

: C24H30O6

Mol W.

: 414.49

Cat No.

: SA26613

Betamethasone Dipropionate, Impurities

Betamethasone Dipropionate EP Impurity A

$75.00 25 mg

In Stock

CAS No.

: 378-44-9

Mol F.

: C22H29FO5

Mol W.

: 392.46

Cat No.

: SA14506

Betamethasone Dipropionate, Impurities

Betamethasone Dipropionate EP Impurity B

$295.00 25 mg

In Stock

CAS No.

: 5534-13-4

Mol F.

: C25H33FO6

Mol W.

: 448.52

Cat No.

: SA14504

Betamethasone Dipropionate, Impurities

Betamethasone Dipropionate EP Impurity C

$145.00 25 mg

In Stock

CAS No.

: 75883-07-7

Mol F.

: C25H33FO6

Mol W.

: 448.52

Cat No.

: SA14501

Betamethasone Dipropionate, Impurities

Betamethasone Dipropionate EP Impurity D

$255.00 25 mg

In Stock

CAS No.

: 5514-81-8

Mol F.

: C27H35FO7

Mol W.

: 490.56

Cat No.

: SA14505

Betamethasone Dipropionate, Impurities

Betamethasone Dipropionate EP Impurity E

$95.00 25 mg

In Stock

CAS No.

: 5534-09-8

Mol F.

: C28H37ClO7

Mol W.

: 521.04

Cat No.

: SA14507

Betamethasone Dipropionate, Impurities

Betamethasone Dipropionate EP Impurity G

$145.00 25 mg

In Stock

CAS No.

: 1186048-33-8

Mol F.

: C31H41FO8

Mol W.

: 560.65

Cat No.

: SA14503

Betamethasone, Impurities

Betamethasone EP Impurity B

$175.00 25 mg

In Stock

CAS No.

: 25122-41-2

Mol F.

: C22H28ClFO4

Mol W.

: 410.91

Cat No.

: SA26602

Betamethasone, Impurities

Betamethasone EP Impurity C

$195.00 25 mg

In Stock

CAS No.

: 13504-15-9

Mol F.

: C22H28O4

Mol W.

: 356.46

Cat No.

: SA26603

Betamethasone, Impurities

Betamethasone EP Impurity D

$195.00 25 mg

In Stock

CAS No.

: 52619-05-3

Mol F.

: C25H33FO7

Mol W.

: 464.52

Cat No.

: SA26604

Betamethasone, Impurities

Betamethasone EP Impurity E

$125.00 25 mg

In Stock

CAS No.

: 981-34-0

Mol F.

: C22H28O5

Mol W.

: 372.45

Cat No.

: SA26605

Betamethasone, Impurities

Betamethasone EP Impurity G

$935.00 25 mg

In Stock

CAS No.

: 85700-75-0

Mol F.

: C22H30O5

Mol W.

: 374.47

Cat No.

: SA26607

Betamethasone Valerate, Impurities

Betamethasone Valerate EP Impurity A

$95.00 25 mg

In Stock

CAS No.

: 378-44-9

Mol F.

: C22H29FO5

Mol W.

: 392.46

Cat No.

: SA18500

Betamethasone Valerate, Impurities

Betamethasone Valerate EP Impurity B

$355.00 25 mg

In Stock

CAS No.

: 1879-77-2

Mol F.

: C22H29FO4

Mol W.

: 376.46

Cat No.

: SA18507

Betamethasone Valerate, Impurities

Betamethasone Valerate EP Impurity C

$195.00 25 mg

In Stock

CAS No.

: 33755-46-3

Mol F.

: C27H37FO6

Mol W.

: 476.58

Cat No.

: SA18501

Betamethasone Valerate

Betamethasone Valerate EP Impurity D

$195.00 25 mg

In Stock

CAS No.

Mol F.

: C27H37BrO6

Mol W.

: 537.48

Cat No.

: SA18506

Betamethasone Valerate, Impurities

Betamethasone Valerate EP Impurity E

$175.00 25 mg

In Stock

CAS No.

: 2240-28-0

Mol F.

: C27H37FO6

Mol W.

: 476.58

Cat No.

: SA18502

Betamethasone Valerate, Impurities

Betamethasone Valerate EP Impurity H

$295.00 25 mg

In Stock

CAS No.

: 52619-18-8

Mol F.

: C27H37ClO6

Mol W.

: 493.03

Cat No.

: SA18504

Betamethasone Valerate, Impurities

Betamethasone Valerate EP Impurity I

$355.00 25 mg

In Stock

CAS No.

: 2802-10-0

Mol F.

: C26H35FO6

Mol W.

: 462.55

Cat No.

: SA18505

Impurities, Valacyclovir

Bis Valacyclovir; Valaciclovir- Impurity P

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In Stock

CAS No.

: 1356019-51-6

Mol F.

: C27H40N12O8

Mol W.

: 660.68

Cat No.

: SA49504

Bisoprolol, Impurities

Bisoprolol

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In Stock

CAS No.

: 66722-44-9 (Freebase); 104344-23-2 (Salt)

Mol F.

: C18H31NO4

Mol W.

: 325.44

Cat No.

: SA35600

Bisoprolol, Impurities

Bisoprolol Benzyl Alcohol Epoxide Impurity

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In Stock

CAS No.

: NA

Mol F.

: C10H12O3

Mol W.

: 180.2

Cat No.

: SA35618

Bisoprolol, Impurities

Bisoprolol EP Impurity A

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In Stock

CAS No.

: 62572-93-4

Mol F.

: C13H21NO3

Mol W.

: 239.31

Cat No.

: SA35601

Bisoprolol, Impurities

Bisoprolol EP Impurity B

Please enquire for price & pack size

In Stock

CAS No.

: 1447715-44-7

Mol F.

: C18H31NO4

Mol W.

: 325.44

Cat No.

: SA35602

Bisoprolol, Impurities

Bisoprolol EP Impurity C

Please enquire for price & pack size

In Stock

CAS No.

: 1797132-90-1

Mol F.

: C25H38N2O4

Mol W.

: 430.58

Cat No.

: SA35603

Bisoprolol, Impurities

Bisoprolol EP Impurity D

Please enquire for price & pack size

In Stock

CAS No.

: 1225195-71-0

Mol F.

: C26H40N2O5

Mol W.

: 460.61

Cat No.

: SA35604

Bisoprolol, Impurities

Bisoprolol EP Impurity K

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In Stock

CAS No.

: 864544-37-6

Mol F.

: C18H29NO5

Mol W.

: 339.43

Cat No.

: SA35609