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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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Bumetanide, Impurities

Bumetanide EP Impurity C

$180.00 25 mg

In Stock

CAS No.

: 32643-00-8

Mol F.

: C21H28N2O5S

Mol W.

: 420.52

Cat No.

: SA24402

Bumetanide, Impurities

Bumetanide EP Impurity D

$250.00 25 mg

In Stock

CAS No.

: 153012-65-8

Mol F.

: C21H28N2O5S

Mol W.

: 420.52

Cat No.

: SA24403

Bupropion, Impurities

Bupropion 4-fluoro-2-bromo impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C9H8BrFO

Mol W.

: 231.06

Cat No.

: SA12241

Bupropion, Impurities

Bupropion Amine Impurity

$110.00 25 mg

In Stock

CAS No.

: 119802-69-6 (Base); 2227990-16-9 (HCl)

Mol F.

: C9H11Cl2NO

Mol W.

: 220.09

Cat No.

: SA12229

Bupropion, Impurities

Bupropion Deschloro 2-Bromo impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C9H9BrO

Mol W.

: 211.98

Cat No.

: SA12239

Bupropion, Impurities

Bupropion Deschloro-3’-2 bromo impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C9H8Br2O

Mol W.

: 291.97

Cat No.

: SA12240

Bupropion, Impurities

Bupropion USP Related Compound A; 3′-Dechloro-4′-chloro Bupropion Hydrochloride

$90.00 25 mg

In Stock

CAS No.

: 1049718-72-0 (HCl Salt); 1251851-01-0 (Fumarate)

Mol F.

: C17H22ClNO5

Mol W.

: 276.2

Cat No.

: SA12204

Bupropion, Impurities

Bupropion USP Related Compound B; 3′-Dechloro-3′-bromo Bupropion Hydrochloride

$110.00 25 mg

In Stock

CAS No.

: 1049718-43-5

Mol F.

: C17H22BrNO5

Mol W.

: 284.19

Cat No.

: SA12220

Buspirone, Impurities

Buspirone Diamide Dimer

$350.00 25 mg

In Stock

CAS No.

Mol F.

: C33H52N10O2

Mol W.

: 620.83

Cat No.

: SA25818

Buspirone, Impurities

Buspirone EP Impurity A

$80.00 25 mg

In Stock

CAS No.

: 20980-22-7

Mol F.

: C8H12N4

Mol W.

: 164.21

Cat No.

: SA25800

Buspirone, Impurities

Buspirone EP Impurity C

$155.00 25 mg

In Stock

CAS No.

: 257877-45-5

Mol F.

: C20H30N8

Mol W.

: 382.51

Cat No.

: SA25802

Buspirone, Impurities

Buspirone EP Impurity D

$195.00 25 mg

In Stock

CAS No.

: 2724726-67-2

Mol F.

: C24H39ClN8O

Mol W.

: 491.07

Cat No.

: SA25803

Buspirone, Impurities

Buspirone EP Impurity E

$150.00 25 mg

In Stock

CAS No.

: 257877-46-6 (HCl Salt)

Mol F.

: C21H33N5O3

Mol W.

: 403.52

Cat No.

: SA25804

Buspirone, Impurities

Buspirone EP Impurity H

$350.00 25 mg

In Stock

CAS No.

: 2708578-34-9

Mol F.

: C33H50N8O4

Mol W.

: 622.8

Cat No.

: SA25807

Buspirone, Impurities

Buspirone EP Impurity J

$350.00 25 mg

In Stock

CAS No.

: 2726492-72-2

Mol F.

: C34H52N6O5

Mol W.

: 624.81

Cat No.

: SA25809

Buspirone, Impurities

Buspirone EP Impurity K

$90.00 25 mg

In Stock

CAS No.

: 1075-89-4

Mol F.

: C9H13NO2

Mol W.

: 167.21

Cat No.

: SA25810

Buspirone, Impurities

Buspirone EP Impurity L

$100.00 25 mg

In Stock

CAS No.

: 21098-11-3

Mol F.

: C13H20ClNO2

Mol W.

: 257.76

Cat No.

: SA25811

Buspirone, Impurities

Buspirone EP Impurity M

$100.00 25 mg

In Stock

CAS No.

: 80827-62-9

Mol F.

: C13H20BrNO2

Mol W.

: 302.21

Cat No.

: SA25812

Buspirone, Impurities

Buspirone EP Impurity N

$250.00 25 mg

In Stock

CAS No.

: 257877-44-4

Mol F.

: C22H32N2O4

Mol W.

: 388.5

Cat No.

: SA25813

Buspirone, Impurities

Buspirone N Oxide Impurity

$150.00 25 mg

In Stock

CAS No.

: 220747-81-9

Mol F.

: C21H31N5O3

Mol W.

: 401.5

Cat No.

: SA25816

Cephalexin, Impurities

C-Phenyl Glycyl Cephalexin.TFA salt

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C24H24N4O5S. C2HF3O2

Mol W.

: 594.55

Cat No.

: SA12010

Impurities, Ulipristal

C17 Epi Ulipristal Acetate

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C30H37NO4

Mol W.

: 475.62

Cat No.

: SA27906

Canagliflozin, Impurities

Canagliflozin 2-Methylphenyl Impurity

$595.00 25 mg

In Stock

CAS No.

: 2161394-95-0

Mol F.

: C24H25FO5S

Mol W.

: 444.5

Cat No.

: SA14924

Canagliflozin

Canagliflozin alpha-Isomer Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 1589590-87-3

Mol F.

: C25H29FO5S

Mol W.

: 444.52

Cat No.

: SA14902

Canagliflozin, Impurities

Canagliflozin Aryl Dimer

$424.00 25 mg

In Stock

CAS No.

: 2443735-74-6

Mol F.

: C36H28F2S2

Mol W.

: 562.75

Cat No.

: SA14906

Canagliflozin

Canagliflozin Defluoro Impurity

$295.00 25 mg

In Stock

CAS No.

: 842133-16-8

Mol F.

: C24H26O5S

Mol W.

: 426.54

Cat No.

: SA14901

Canagliflozin, Impurities

Canagliflozin Enantiomer impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C24H25FO5S

Mol W.

: 444.53

Cat No.

: SA14905

Cangliflozin, Impurities

Canagliflozin EP Impurity C, Canagliflozin Hydroxy Impurity

$425.00 100 mg

In Stock

CAS No.

: 1951467-29-0

Mol F.

: C24H25FO6S

Mol W.

: 460.52

Cat No.

: SA14921

Canagliflozin, Impurities

Canagliflozin Hydroxy Impurity

$145.00 25 mg

In Stock

CAS No.

Mol F.

: C18H15FOS

Mol W.

: 298.38

Cat No.

: SA14915

Canagliflozin, Impurities

Canagliflozin Impurity F

Please enquire for price & pack size

In Stock

CAS No.

: 1071929-08-2

Mol F.

: C18H12FIOS

Mol W.

: 422.26

Cat No.

: SA14922

Canagliflozin, Impurities

Canagliflozin Iodo Impurity

$85.00 25 mg

In Stock

CAS No.

: 898566-17-1

Mol F.

: C18H14FIS

Mol W.

: 408.28

Cat No.

: SA14914

Canagliflozin, Impurities

Canagliflozin Keto Impurity

$195.00 25 mg

In Stock

CAS No.

: 1951467-28-9

Mol F.

: C24H23FO6S

Mol W.

: 458.5

Cat No.

: SA14919

Canagliflozin, Impurities

Canagliflozin Monoacetyl Impurity

$135.00 25 mg

In Stock

CAS No.

Mol F.

: C26H27FO6S

Mol W.

: 486.56

Cat No.

: SA14912

Canagliflozin, Impurities

Canagliflozin Monopropionyl Impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C27H29FO6S

Mol W.

: 500.579

Cat No.

: SA14932

Canagliflozin

Canagliflozin Propionyl Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 1985644-93-6

Mol F.

: C36H41FO9S

Mol W.

: 668.769

Cat No.

: SA14933

Canagliflozin, Impurities

Canagliflozin Tetraacetate

$135.00 25 mg

In Stock

CAS No.

: 866607-35-4

Mol F.

: C32H33FO9S

Mol W.

: 612.66

Cat No.

: SA14909

Canagliflozin, Impurities

Cangliflozin Ring opening impurity

$425.00 25 mg

In Stock

CAS No.

Mol F.

: C24H27FO6S

Mol W.

: 462.54

Cat No.

: SA14908

Cangrelor, Impurities

Cangrelor 6-Amino Triol Impurity

$595.00 25 mg

In Stock

CAS No.

: 163706-51-2

Mol F.

: C₁₃H₁₆F₃N₅O₄S

Mol W.

: 395.36

Cat No.

: SA29402

Cangrelor, Impurities

Cangrelor Triol Impurity

$125.00 25 mg

In Stock

CAS No.

: 163706-58-9

Mol F.

: C16H22F3N5O4S2

Mol W.

: 469.5

Cat No.

: SA29406

Capecitabine, Impurities

Capecitabine EP Impurity C

$80.00 25 mg

In Stock

CAS No.

: 161599-46-8

Mol F.

: C13H16FN3O6

Mol W.

: 329.28

Cat No.

: SA37803

Capecitabine, Impurities

Capecitabine EP Impurity D

$150.00 25 mg

In Stock

CAS No.

: 910129-15-6

Mol F.

: C15H22FN3O6

Mol W.

: 359.35

Cat No.

: SA37804

Capecitabine, Impurities

Capecitabine EP Impurity E

$250.00 25 mg

In Stock

CAS No.

: 162204-30-0

Mol F.

: C15H22FN3O6

Mol W.

: 359.35

Cat No.

: SA37805

Capecitabine, Impurities

Capecitabine EP Impurity G

$150.00 25 mg

In Stock

CAS No.

: 162204-20-8

Mol F.

: C19H26FN3O8

Mol W.

: 443.42

Cat No.

: SA37807

Carbamazepine, Impurities

Carbamazepine EP impurity A

$95.00 25 mg

In Stock

CAS No.

: 3564-73-6

Mol F.

: C15H14N2O

Mol W.

: 238.28

Cat No.

: SA20319

Carbamazepine, Impurities

Carbamazepine EP Impurity C

$155.00 25 mg

In Stock

CAS No.

: 1219170-51-0

Mol F.

: C16H13N3O2

Mol W.

: 279.29

Cat No.

: SA20309

Carbamazepine, Impurities

Carbamazepine EP Impurity D

$75.00 25 mg

In Stock

CAS No.

: 256-96-2

Mol F.

: C14H11N

Mol W.

: 193.24

Cat No.

: SA20310

Carbamazepine, Impurities

Carbamazepine EP Impurity E

$75.00 25 mg

In Stock

CAS No.

: 494-19-9

Mol F.

: C14H13N

Mol W.

: 195.26

Cat No.

: SA20311

Carbamazepine, Impurities

Carbamazepine; Oxcarbazepine EP Impurity A

$75.00 25 mg

In Stock

CAS No.

: 298-46-4

Mol F.

: C15H12N2O

Mol W.

: 236.27

Cat No.

: SA20314

Carbidopa, Impurities

Carbidopa EP Impurity A

$75.00 25 mg

In Stock

CAS No.

: 555-30-6; 41372-08-1 (hydrate)

Mol F.

: C10H13NO4

Mol W.

: 211.21

Cat No.

: SA31801

Carbidopa, Impurities

Carbidopa EP Impurity B

$295.00 25 mg

In Stock

CAS No.

: 18181-08-3

Mol F.

: C11H15NO4

Mol W.

: 225.24

Cat No.

: SA31802