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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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Albendazole, Impurities

Albendazole EP Impurity B

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CAS No.

: 54029-12-8

Mol F.

: C12H15N3O3S

Mol W.

: 281.33

Cat No.

: SA31102

Albendazole, Impurities

Albendazole EP Impurity C

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CAS No.

: 75184-71-3

Mol F.

: C12H15N3O4S

Mol W.

: 297.33

Cat No.

: SA31103

Albendazole, Impurities

Albendazole EP Impurity D

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CAS No.

: 80983-34-2

Mol F.

: C10H13N3O2S

Mol W.

: 239.29

Cat No.

: SA31104

Albendazole, Impurities

Albendazole EP Impurity E

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CAS No.

: 10605-21-7

Mol F.

: C9H9N302

Mol W.

: 191.19

Cat No.

: SA31105

Albendazole, Impurities

Albendazole EP Impurity F

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CAS No.

: 80983-45-5

Mol F.

: C10H11N302S

Mol W.

: 237.28

Cat No.

: SA31106

Albendazole, Impurities

Albendazole EP Impurity I

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CAS No.

: 20559-55-1

Mol F.

: C12H15N3O3

Mol W.

: 249.3

Cat No.

: SA31111

Albendazole, Impurities

Albendazole Impurity G

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CAS No.

: 139751-05-6

Mol F.

: C13H17N3O2S

Mol W.

: 279.36

Cat No.

: SA31107

Albendazole, Impurities

Albendazole Impurity H

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CAS No.

: 20367-38-8

Mol F.

: C9H8ClN3O2

Mol W.

: 225.63

Cat No.

: SA31108

Albendazole, Impurities

Albendazole Mercapto Analog

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CAS No.

: 79213-76-6

Mol F.

: C9H9N3O2S

Mol W.

: 223.25

Cat No.

: SA31110

Impurities, Salbutamol

Albuterol Related Compound F | CAS : 1221742-55-7

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CAS No.

: 1221742-55-7

Mol F.

: C15H25NO3

Mol W.

: 267.4

Cat No.

: SA26022

Alcaftadine, Impurities

Alcaftadine

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CAS No.

: 147084-10-4

Mol F.

: C19H21N3O

Mol W.

: 307.39

Cat No.

: SA31000

Alcaftadine, Impurities

Alcaftadine 3-Carboxylic Acid Impurity

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CAS No.

: 147083-93-0

Mol F.

: C19H21N3O2

Mol W.

: 323.39

Cat No.

: SA31001

Alcaftadine, Impurities

Alcaftadine 3-hydroxy methyl Impurity

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CAS No.

: 147083-89-4

Mol F.

: C19H23N3O

Mol W.

: 309.41

Cat No.

: SA31003

Alcaftadine, Impurities

Alcaftadine di hydroxymethyl Impurity

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CAS No.

: 147083-92-9

Mol F.

: C20H25N3O2

Mol W.

: 339.44

Cat No.

: SA31007

Alcaftadine, Impurities

Alcaftadine dicarboxaldehyde Impurity

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CAS No.

: NA

Mol F.

: C20H21N3O2

Mol W.

: 335.41

Cat No.

: SA31005

Alcaftadine, Impurities

Alcaftadine Open Ring Impurity

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CAS No.

: NA

Mol F.

: C18H23N3O

Mol W.

: 297.4

Cat No.

: SA31004

Alcaftadine, Impurities

Alcaftadine-N-Oxide

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CAS No.

: 952649-75-1

Mol F.

: C19H21N3O2

Mol W.

: 323.39

Cat No.

: SA31002

Alogliptin, Impurities

Alcohol Impurity of Alogliptin

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CAS No.

: NA

Mol F.

: C13H11N3O3

Mol W.

: 257.2

Cat No.

: SA54112

Donepezil, Impurities

Aldehyde Impurity Donepezil Impurity

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CAS No.

: 22065-85-6

Mol F.

: C13H17NO

Mol W.

: 203.28

Cat No.

: SA34320

Alfuzosin, Impurities

Alfuzosin

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CAS No.

: 81403-80-7

Mol F.

: C19H27N5O4

Mol W.

: 389.46

Cat No.

: SA55400

Alfuzosin, Impurities

Alfuzosin EP Impurity A

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CAS No.

: 98902-36-4

Mol F.

: C19H23N5O4

Mol W.

: 385.42

Cat No.

: SA55401

Alfuzosin, Impurities

Alfuzosin EP Impurity B

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CAS No.

: 23680-84-4

Mol F.

: C10H10ClN3O2

Mol W.

: 239.66

Cat No.

: SA55402

Alfuzosin, Impurities

Alfuzosin EP Impurity C

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CAS No.

: 98902-34-2

Mol F.

: C19H27N5O4

Mol W.

: 389.45

Cat No.

: SA55403

Alfuzosin, Impurities

Alfuzosin EP Impurity D

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CAS No.

: 76362-29-3

Mol F.

: C14H21N5O2

Mol W.

: 291.35

Cat No.

: SA55404

Alfuzosin, Impurities

Alfuzosin EP Impurity E

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CAS No.

: 1026411-59-5

Mol F.

: C15H21N5O3

Mol W.

: 319.37

Cat No.

: SA55405

Alfuzosin, Impurities

Alfuzosin EP Impurity F

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CAS No.

: 19216-53-6

Mol F.

: C12H16N4O2

Mol W.

: 248.28

Cat No.

: SA55406

Alfuzosin, Impurities

Alfuzosin EP Impurity G

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CAS No.

: 928780-95-4

Mol F.

: C24H30N8O4

Mol W.

: 494.55

Cat No.

: SA55407

Citalopram, Impurities

Alkene Dimer Citalopram impurity

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CAS No.

: 1370643-27-8

Mol F.

: C40H41ClF2N4O

Mol W.

: 667.23

Cat No.

: SA17020

Allopurinol, Impurities

Allopurinol

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CAS No.

: 315-30-0

Mol F.

: C5H4N4O

Mol W.

: 136.11

Cat No.

: SA28900

Allopurinol, Impurities

Allopurinol EP Impurity A

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CAS No.

: 27511-79-1

Mol F.

: C4H6N4O

Mol W.

: 126.12

Cat No.

: SA28901

Allopurinol, Impurities

Allopurinol EP Impurity B

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CAS No.

: 22407-20-1

Mol F.

: C5H6N4O2

Mol W.

: 154.13

Cat No.

: SA28902

Allopurinol, Impurities

Allopurinol EP Impurity C

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CAS No.

: 1346604-13-4

Mol F.

: C6H6N6O

Mol W.

: 178.15

Cat No.

: SA28903

Allopurinol, Impurities

Allopurinol EP Impurity D

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CAS No.

: 6994-25-8

Mol F.

: C6H9N3O2

Mol W.

: 155.15

Cat No.

: SA28904

Allopurinol, Impurities

Allopurinol EP Impurity E

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CAS No.

: 31055-19-3

Mol F.

: C7H9N3O3

Mol W.

: 183.16

Cat No.

: SA28905

Allopurinol, Impurities

Allopurinol EP Impurity F

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CAS No.

: 302-01-2

Mol F.

: H4N4

Mol W.

: 32.05

Cat No.

: SA28906

Allopurinol, Impurities

Allopurinol Nitrile Impurity

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CAS No.

: 16617-46-2

Mol F.

: C4H4N4

Mol W.

: 108.10

Cat No.

: SA28917

Allopurinol, Impurities

Allopurinol riboside

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CAS No.

: 16220-07-8

Mol F.

: C10H12N4O5

Mol W.

: 268.23

Cat No.

: SA28911

Allopurinol, Impurities

Allopurinol USP Related Compound F

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CAS No.

: 321571-07-7

Mol F.

: C12H14N4O4

Mol W.

: 278.26

Cat No.

: SA28916

Alogliptin, Impurities

Alogliptin 1-Methylpyrimidine Trione Impurity

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CAS No.

: 2565-47-1

Mol F.

: C5H6N2O3

Mol W.

: 142.1

Cat No.

: SA54120

Alogliptin, Impurities, Nitrosamine

Alogliptin 1-nitrosopiperidinyl amino (S) Isomer Impurity

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CAS No.

: NA

Mol F.

: C18H20N6O3

Mol W.

: 368.4

Cat No.

: SA54130

Alogliptin, Impurities

Alogliptin 2-(Bromomethyl)Benzamide Impurity

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CAS No.

: 872414-52-3

Mol F.

: C8H8BrNO

Mol W.

: 214.1

Cat No.

: SA54121

Alogliptin, Impurities

Alogliptin 2-Cyanobenzyl Benzamide Impurity

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CAS No.

: 2749281-73-8

Mol F.

: C25H25N5O3

Mol W.

: 443.5

Cat No.

: SA54127

Alogliptin, Impurities

Alogliptin 2-Cyanobenzyl Benzonitrile Impurity

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CAS No.

: 2749424-28-8

Mol F.

: C26H26N6O2

Mol W.

: 454.5

Cat No.

: SA54129

Alogliptin, Impurities

Alogliptin 6-Methoxy-3-methyl-dihydropyrimidinyl Benzonitrile Impurity

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CAS No.

: 2514763-78-9

Mol F.

: C14H13N3O3

Mol W.

: 271.3

Cat No.

: SA54125

Alogliptin, Impurities

Alogliptin Aminopiperidinyl Benzonitrile

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CAS No.

: 1353254-17-7

Mol F.

: C13H17N3

Mol W.

: 215.3

Cat No.

: SA54117

Alogliptin, Impurities

Alogliptin Aminopiperidinyl-3-methylpyrimidinedione Impurity

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CAS No.

: 2276316-91-5

Mol F.

: C10H16N4O2

Mol W.

: 224.3

Cat No.

: SA54124

Alogliptin, Impurities

Alogliptin Benzoate

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CAS No.

: 850649-62-6

Mol F.

: C18H21N5O2 : C7H6O2

Mol W.

: 339.4 : 122.1

Cat No.

: SA54100

Alogliptin, Impurities

Alogliptin Benzoate Dimer Impurity

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CAS No.

: 1268836-55-0

Mol F.

: C31H30N8O4

Mol W.

: 578.6

Cat No.

: SA54113

Alogliptin, Impurities, Nitrosamine

Alogliptin Benzoate Dimer Nitroso Impurity

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CAS No.

: NA

Mol F.

: C31H29N9O5

Mol W.

: 607.6

Cat No.

: SA54114

Alogliptin, Impurities

Alogliptin Chloro-N-ethyl Dihydropyrimidinyl Benzonitrile Impurity

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CAS No.

: 1430222-06-2

Mol F.

: C14H12ClN3O2

Mol W.

: 289.7

Cat No.

: SA54123