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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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Acetaminophen, Impurities

Acetaminophen EP Impurity L

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CAS No.

: NA

Mol F.

: C16H16N2O4

Mol W.

: 300.31

Cat No.

: SA37012

Aciclovir, Impurities

Acetyl 2-[(2-Formamide-1,6-dihydro-6-chloro-9H-purin-9yl)methoxy]ethyl Ester

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CAS No.

: 1346598-89-7

Mol F.

: C11H12ClN5O4

Mol W.

: 316.7

Cat No.

: SA21428

Aciclovir, Impurities

Aciclovir

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CAS No.

: 59277-89-3

Mol F.

: C8H11N5O3

Mol W.

: 225.2

Cat No.

: SA21401

Aciclovir, Impurities

Aciclovir Acid

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CAS No.

: 80685-22-9

Mol F.

: C8H9N5O4

Mol W.

: 239.19

Cat No.

: SA21430

Aciclovir, Impurities

Aciclovir EP Impurity I

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CAS No.

: 1797832-75-7

Mol F.

: C14H16N10O4

Mol W.

: 388.34

Cat No.

: SA21415

Aciclovir, Impurities

Aciclovir EP Impurity Q

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CAS No.

: NA

Mol F.

: C9H13N5O4

Mol W.

: 255.24

Cat No.

: SA21414

Aciclovir, Impurities

Aciclovir EP Impurity R

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CAS No.

: NA

Mol F.

: C17H22N10O6

Mol W.

: 462.42

Cat No.

: SA21419

Aciclovir, Impurities

Aciclovir Monophosphate

$295.00 25 mg

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CAS No.

: 66341-16-0

Mol F.

: C8H12N5O6P

Mol W.

: 305.18

Cat No.

: SA21421

Aciclovir, Impurities

Aciclovir N-Methyl-L-valinate Hydrochloride

$250.00 25 mg

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CAS No.

: 1346617-39-7

Mol F.

: C14H23ClN6O4

Mol W.

: 374.82

Cat No.

: SA21420

Impurities, Oxcarbazepine

Acridine

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CAS No.

: 260-94-6

Mol F.

: C13H9N

Mol W.

: 179.22

Cat No.

: SA12508

Oxcarbazepine

Acridine Carboxylic Acid Hydrate

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CAS No.

: 332927-03-4

Mol F.

: C15H9NO2

Mol W.

: 233.23

Cat No.

: SA12502

Albendazole, Impurities

Albendazole

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CAS No.

: 54965-21-8

Mol F.

: C12H15N3O2S

Mol W.

: 265.33

Cat No.

: SA31100

Albendazole, Impurities

Albendazole Chlorosulfonyl Analog

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CAS No.

: 79213-74-4

Mol F.

: C9H8ClN3O4S

Mol W.

: 289.7

Cat No.

: SA31109

Albendazole, Impurities

Albendazole EP Impurity A

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CAS No.

: 80983-36-4

Mol F.

: C10H13N3S

Mol W.

: 207.3

Cat No.

: SA31101

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 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

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

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

Fingolimod, Impurities

alpha-Amino Acid Fingolimod Impurity

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CAS No.

: 596820-19-8

Mol F.

: C18H29NO2

Mol W.

: 291.43

Cat No.

: SA34505

Dapagliflozin, Impurities

Alpha-Ethoxy Dapagliflozin Analog

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CAS No.

: 2173339-31-4

Mol F.

: C23H29ClO7

Mol W.

: 452.9

Cat No.

: SA15088

Dapagliflozin, Impurities

Alpha-Methoxy Dapagliflozin Ketone Impurity

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CAS No.

: 2377899-45-9

Mol F.

: C22H25ClO8

Mol W.

: 452.9

Cat No.

: SA15082

Amiodarone, Impurities

Amiodarone

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CAS No.

: 19774-82-4

Mol F.

: C25H30ClI2NO3

Mol W.

: 681.77

Cat No.

: SA26400

Amiodarone, Impurities

Amiodarone Didesethyl Impurity

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CAS No.

: 94317-95-0 (Base); 757220-04-5(HCl salt)

Mol F.

: C21H21I2NO3

Mol W.

: 589.21

Cat No.

: SA26409

Amiodarone, Impurities

Amiodarone EP Impurity A

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CAS No.

: 23551-25-9 (Base); 95820-13-6 (HCl Salt)

Mol F.

: C25H31NO3

Mol W.

: 393.52

Cat No.

: SA26401

Amiodarone, Impurities

Amiodarone EP Impurity B

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CAS No.

: 83409-32-9(Base);96027-74-6(HClSalt)

Mol F.

: C23H25I2NO3

Mol W.

: 617.26

Cat No.

: SA26402

Amiodarone, Impurities

Amiodarone EP Impurity C

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CAS No.

: 85642-08-6

Mol F.

: C25H30INO3

Mol W.

: 519.41

Cat No.

: SA26403