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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, Triamcinolone Acetonide

Triamcinolone Acetonide EP Impurity E

$125.00 25 mg

In Stock

CAS No.

: 1524-86-3

Mol F.

: C24H33FO6

Mol W.

: 436.51

Cat No.

: SA30205

Impurities, Triamcinolone Acetonide

Triamcinolone Acetonide EP Impurity F

$125.00 25 mg

In Stock

CAS No.

: 3870-07-3

Mol F.

: C26H33FO7

Mol W.

: 476.53

Cat No.

: SA30206

Impurities, Linagliptin

Trifluoro acetyl amino Linagliptin

Please enquire for price & pack size

In Stock

CAS No.

: 1673546-62-7

Mol F.

: C27H27F3N8O3

Mol W.

: 568.6

Cat No.

: SA49926

Impurities, Trimethoprim

Trimethoprim EP Impurity A

$175.00 25 mg

In Stock

CAS No.

: 213745-86-9

Mol F.

: C15H20N4O3

Mol W.

: 304.34

Cat No.

: SA27101

Impurities, Trimethoprim

Trimethoprim EP Impurity B

$180.00 25 mg

In Stock

CAS No.

: 30806-86-1

Mol F.

: C14H16N4O4

Mol W.

: 304.34

Cat No.

: SA27102

Impurities, Trimethoprim

Trimethoprim EP Impurity D

$175.00 25 mg

In Stock

CAS No.

: 92440-76-1

Mol F.

: C14H17N3O4

Mol W.

: 291.3

Cat No.

: SA27104

Impurities, Trimethoprim

Trimethoprim EP Impurity F

$155.00 25 mg

In Stock

CAS No.

: 16285-82-8

Mol F.

: C13H15BrN4O2

Mol W.

: 339.13

Cat No.

: SA27106

Impurities, Trimethoprim

Trimethoprim EP Impurity G

$155.00 25 mg

In Stock

CAS No.

: 78025-68-0

Mol F.

: C15H20N4O3

Mol W.

: 304.34

Cat No.

: SA27107

Impurities, Trimethoprim

Trimethoprim EP Impurity H

$79.00 25 mg

In Stock

CAS No.

: 1916-07-0

Mol F.

: C11H14O5

Mol W.

: 226.23

Cat No.

: SA27108

Impurities, Trimethoprim

Trimethoprim EP Impurity I

$95.00 25 mg

In Stock

CAS No.

: 30078-48-9

Mol F.

: C19H20N2O3

Mol W.

: 324.37

Cat No.

: SA27109

Impurities, Trimethoprim

Trimethoprim EP Impurity J

$75.00 25 mg

In Stock

CAS No.

: 118-41-2

Mol F.

: C10H12O5

Mol W.

: 212.2

Cat No.

: SA27110

Impurities, Irgafos168

Tris(2,4-di-tert-butylphenyl)phosphate (Irgafos 168)

Please enquire for price & pack size

In Stock

CAS No.

: 95906-11-9

Mol F.

: C42H63O4P

Mol W.

: 662.92

Cat No.

: SA13301

Impurities, Olmesartan Medoxomil

Trityl Olmesartan

$110.00 25 mg

In Stock

CAS No.

: 144690-92-6

Mol F.

: C48H44N6O6

Mol W.

: 800.9

Cat No.

: SA17727

Impurities, Tiotropium

Tropenol hydrochloride

$80.00 25 mg

In Stock

CAS No.

: 99709-24-7

Mol F.

: C8H14ClNO

Mol W.

: 175.65

Cat No.

: SA11714

Impurities, Trospium

Trospium Impuity A

Please enquire for price & pack size

In Stock

CAS No.

: 76-93-7

Mol F.

: C14H12O3

Mol W.

: 228.24

Cat No.

: SA17303

Impurities, Tulobuterol

Tulobuterol Hydrochloride

Please enquire for price & pack size

In Stock

CAS No.

: 56776-01-3

Mol F.

: C12H19Cl2NO

Mol W.

: 264.19

Cat No.

: SA19601

Impurities, Molnupiravir

Uridine

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C9H13N3O6

Mol W.

: 259.22

Cat No.

: SA46201

Impurities, Ursodiol

Ursodeoxycholic Acid EP Impurity D

Please enquire for price & pack size

In Stock

CAS No.

: 2955-27-3

Mol F.

: C24H40O5

Mol W.

: 408.57

Cat No.

: SA31210

Impurities, Ursodiol

Ursodeoxycholic Acid EP Impurity I

Please enquire for price & pack size

In Stock

CAS No.

: 130593-75-8

Mol F.

: C24H42O3

Mol W.

: 378.59

Cat No.

: SA31209

Impurities, Ursodiol

Ursodeoxycholic Acid Methyl Ester

Please enquire for price & pack size

In Stock

CAS No.

: 10538-55-3

Mol F.

: C25H42O4

Mol W.

: 406.6

Cat No.

: SA31207

Capecitabine, Impurities

USP Capecitabine 2-O-BDR Impurity

$950.00 25 mg

In Stock

CAS No.

: 1262133-66-3

Mol F.

: C20H30FN3O9

Mol W.

: 475.46

Cat No.

: SA37808

Capecitabine, Impurities

USP Capecitabine 3-O-BDR Impurity

$1,250.00 25 mg

In Stock

CAS No.

: 1262133-64-1

Mol F.

: C20H30FN3O9

Mol W.

: 475.46

Cat No.

: SA37813

Capecitabine, Impurities

USP Capecitabine Related Compound I

$1,875.00 25 mg

In Stock

CAS No.

: 1262133-68-5

Mol F.

: C20H30FN3O9

Mol W.

: 475.46

Cat No.

: SA37809

Duloxetine, Impurities

USP Duloxetine Related Compound H

$100.00 25 mg

In Stock

CAS No.

: 199191-66-7

Mol F.

: C22H23NO4S

Mol W.

: 397.49

Cat No.

: SA36308

Exemestane, Impurities

USP Exemestane Related Compound B

Please enquire for price & pack size

In Stock

CAS No.

: 121021-51-0

Mol F.

: C20H26O3

Mol W.

: 314.42

Cat No.

: SA19110

Impurities, Loratadine

USP Loratadine Related Compound A

$75.00 25 mg

In Stock

CAS No.

: 100643-71-8

Mol F.

: C19H19ClN2

Mol W.

: 310.82

Cat No.

: SA34004

Impurities, Loratadine

USP Loratadine Related Compound B

$95.00 25 mg

In Stock

CAS No.

: 38092-89-6

Mol F.

: C20H21ClN2

Mol W.

: 324.85

Cat No.

: SA34007

Impurities, Loratadine

USP Loratadine Related Compound D

$95.00 25 mg

In Stock

CAS No.

: 38089-93-9

Mol F.

: C20H23ClN2O

Mol W.

: 342.86

Cat No.

: SA34009

Loratadine

USP Loratadine Related Compound E

$155.00 25 mg

In Stock

CAS No.

: 133330-60-6

Mol F.

: C14H9Cl2NO

Mol W.

: 278.13

Cat No.

: SA34010

Impurities, Loratadine

USP Loratadine Related Compound G

$295.00 25 mg

In Stock

CAS No.

: 165739-83-3

Mol F.

: C22H22Cl2N2O2

Mol W.

: 417.33

Cat No.

: SA34003

Impurities, Loratadine

USP Loratadine Related Compound H

$795.00 25 mg

In Stock

CAS No.

: 2470226-18-5

Mol F.

: C22H21ClN2O2

Mol W.

: 380.87

Cat No.

: SA34011

Impurities, Loratadine

USP Loratadine Related Compound I

$355.00 25 mg

In Stock

CAS No.

: 133330-56-0

Mol F.

: C22H21ClN2O2

Mol W.

: 380.87

Cat No.

: SA34012

Impurities, Valacyclovir

Valaciclovir EP Impurity E

Please enquire for price & pack size

In Stock

CAS No.

: 124832-31-1

Mol F.

: C21H26N6O6

Mol W.

: 458.47

Cat No.

: SA49503

Impurities, Valacyclovir

Valacyclovir Valine

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C18H29N7O5

Mol W.

: 423.47

Cat No.

: SA49501

Impurities, Venlafaxine

Venlafaxine Anhydro O-Desmethyl; Desvenlafaxine USP Related Compound A

$255.00 25 mg

In Stock

CAS No.

: 1346600-38-1

Mol F.

: C16H23NO

Mol W.

: 245.36

Cat No.

: SA22704

Impurities, Venlafaxine

Venlafaxine Cyano

$95.00 25 mg

In Stock

CAS No.

: 93413-76-4

Mol F.

: C15H19NO2

Mol W.

: 245.32

Cat No.

: SA22705

Impurities, Venlafaxine

Venlafaxine EP Impurity A

$125.00 25 mg

In Stock

CAS No.

: 775-33-7; 50822-98-5

Mol F.

: C11H17NO

Mol W.

: 179.26

Cat No.

: SA22700

Impurities, Venlafaxine

Venlafaxine EP Impurity C

$95.00 100 mg

In Stock

CAS No.

: 130198-05-9

Mol F.

: C15H24ClNO2

Mol W.

: 285.81

Cat No.

: SA22702

Impurities, Venlafaxine

Venlafaxine EP Impurity D; Venlafaxine USP Related Compound A

$95.00 25 mg

In Stock

CAS No.

: 149289-30-5

Mol F.

: C16H25NO2

Mol W.

: 263.38

Cat No.

: SA22707

Impurities, Venlafaxine

Venlafaxine EP Impurity E

$95.00 25 mg

In Stock

CAS No.

: 93413-56-0; 93413-70-8

Mol F.

: C17H26ClNO2

Mol W.

: 311.85

Cat No.

: SA22708

Impurities, Venlafaxine

Venlafaxine EP Impurity F

$145.00 25 mg

In Stock

CAS No.

: 93413-79-7; 93413-57-1

Mol F.

: C17H26ClNO

Mol W.

: 295.85

Cat No.

: SA22709

Impurities, Venlafaxine

Venlafaxine EP Impurity G

$95.00 25 mg

In Stock

CAS No.

: 1076199-92-2; 2108968-20-1

Mol F.

: C17H28ClNO

Mol W.

: 297.86

Cat No.

: SA22710

Impurities, Venlafaxine

Venlafaxine EP Impurity H

$190.00 25 mg

In Stock

CAS No.

: 1329795-88-1

Mol F.

: C24H33NO3

Mol W.

: 383.52

Cat No.

: SA22703

Impurities, Venlafaxine

Venlafaxine HCl

Please enquire for price & pack size

In Stock

CAS No.

: 99300-78-4

Mol F.

: C17H28ClNO2

Mol W.

: 313.86

Cat No.

: SA22711

Impurities, Venlafaxine

Venlafaxine N-Oxide

$120.00 25 mg

In Stock

CAS No.

: 1094598-37-4

Mol F.

: C17H27NO3

Mol W.

: 293.4

Cat No.

: SA22712

Impurities, Venlafaxine

Venlafaxine O-Desmethyl

$78.00 25 mg

In Stock

CAS No.

: 93413-62-8

Mol F.

: C16H25NO2

Mol W.

: 263.38

Cat No.

: SA22713

Impurities, Venlafaxine

Venlafaxine O-Desmethyl N-Desmethyl

$195.00 25 mg

In Stock

CAS No.

: 135308-74-6

Mol F.

: C15H23NO2

Mol W.

: 249.35

Cat No.

: SA22715

Impurities, Venlafaxine

Venlafaxine O-Desmethyl N,N-Didesmethyl

$195.00 10 mg

In Stock

CAS No.

: 149289-29-2; 135308-76-8

Mol F.

: C14H21NO2

Mol W.

: 235.32

Cat No.

: SA22714

Impurities, Vildagliptin

Vildagliptin (2R)-Isomer

$245.00 25 mg

In Stock

CAS No.

: 1036959-27-9

Mol F.

: C17H25N3O2

Mol W.

: 303.4

Cat No.

: SA23906

Vildagliptin

Vildagliptin Amide Impurity

$135.00 25 mg

In Stock

CAS No.

: 565453-39-6

Mol F.

: C17H27N3O3

Mol W.

: 321.41

Cat No.

: SA23907