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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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Ezetimibe, Impurities

Ezetimibe Hydroxy Glucuronide

$995.00 25 mg

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CAS No.

: 536709-33-8

Mol F.

: C30H29F2NO9

Mol W.

: 585.56

Cat No.

: SA14824

Ezetimibe, Impurities

Ezetimibe Lactam Cleaved Alcohol; 3’-Anhydro Ezetimibe Alcohol Impurity

$995.00 25 mg

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CAS No.

: 1374250-07-3

Mol F.

: C24H23F2NO2

Mol W.

: 395.45

Cat No.

: SA14817

Ezetimibe, Impurities

Ezetimibe meta-Fluorobenzene Isomer

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CAS No.

Mol F.

: C24H21F2NO3

Mol W.

: 409.43

Cat No.

: SA14858

Ezetimibe, Impurities

Ezetimibe Phenexy Glucuronide

$950.00 25 mg

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CAS No.

: 190448-57-8

Mol F.

: C30H29F2NO9

Mol W.

: 585.56

Cat No.

: SA14823

Ezetimibe, Impurities

Ezetimibe Triol Impurity

$1,550.00 25 mg

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CAS No.

: 2363086-22-8

Mol F.

: C33H30F2N2OS

Mol W.

: 572.61

Cat No.

: SA14830

Famciclovir, Impurities

Famciclovir

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CAS No.

: 104227-87-4

Mol F.

: C14H19N5O4

Mol W.

: 321.4

Cat No.

: SA48300

Famciclovir, Impurities

Famciclovir 2-hydroxypropane Derivative

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CAS No.

: 172645-79-3

Mol F.

: C14H19N5O5

Mol W.

: 337.3

Cat No.

: SA48319

Famciclovir, Impurities

Famciclovir 3-acetoxy-2-methylpropanoate Impurity

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CAS No.

: NA

Mol F.

: C15H21N5O4

Mol W.

: 335.4

Cat No.

: SA48325

Famciclovir, Impurities

Famciclovir 3-hydroxypropanoate Derivative

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CAS No.

: NA

Mol F.

: C12H17N5O3

Mol W.

: 279.3

Cat No.

: SA48324

Famciclovir, Impurities

Famciclovir 4-hydroxybutyl Impurity

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CAS No.

: 23169-37-1

Mol F.

: C9H13N5O2

Mol W.

: 223.2

Cat No.

: SA48314

Famciclovir, Impurities

Famciclovir 6- Amino Derivative

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CAS No.

: 97845-71-1

Mol F.

: C10H16N6O2

Mol W.

: 252.3

Cat No.

: SA48308

Famciclovir, Impurities

Famciclovir 6- Hydroxy Derivative

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CAS No.

: 234110-22-6

Mol F.

: C10H11N5O5

Mol W.

: 281.3

Cat No.

: SA48313

Famciclovir, Impurities

Famciclovir 6- Methoxy Derivative

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CAS No.

: 97845-65-3

Mol F.

: C10H11N5O5

Mol W.

: 267.3

Cat No.

: SA48312

Famciclovir, Impurities

Famciclovir 6-Alkylamino Impurity

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CAS No.

: NA

Mol F.

: C23H34N6O8

Mol W.

: 522.6

Cat No.

: SA48315

Famciclovir, Impurities

Famciclovir 6-Oxo 4-butyl Acetate Impurity

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CAS No.

: 183475-21-0

Mol F.

: C11H15N5O3

Mol W.

: 265.3

Cat No.

: SA48321

Famciclovir, Impurities

Famciclovir 6-Oxo Desacetyl Dimer Impurity

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CAS No.

: NA

Mol F.

: C20H28N10O5

Mol W.

: 488.5

Cat No.

: SA48320

Famciclovir, Impurities

Famciclovir 6-Oxo, 7-Alkylamino Impurity

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CAS No.

: 127205-22-5

Mol F.

: C10H15N5O3

Mol W.

: 253.3

Cat No.

: SA48316

Famciclovir, Impurities

Famciclovir 7-Acetate Impurity

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CAS No.

: NA

Mol F.

: C16H23N5O5

Mol W.

: 365.4

Cat No.

: SA48323

Famciclovir, Impurities

Famciclovir Ethyl 1,4-Diacetate Derivative

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CAS No.

: 174155-69-2

Mol F.

: C15H21N5O4

Mol W.

: 335.4

Cat No.

: SA48322

Famciclovir, Impurities

Famciclovir Malonate

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CAS No.

: 122497-20-5

Mol F.

: C12H15N5O4

Mol W.

: 293.3

Cat No.

: SA48309

Famciclovir, Impurities

Famciclovir Methoxycarbonyl Analog

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CAS No.

: NA

Mol F.

: C13H17N5O4

Mol W.

: 307.3

Cat No.

: SA48311

Famciclovir, Impurities

Famciclovir Methyl 1,4-Diacetate Derivative

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CAS No.

: 126589-69-3

Mol F.

: C14H19N5O4

Mol W.

: 321.3

Cat No.

: SA48317

Famciclovir, Impurities

Famciclovir N-Acetyl Impurity

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CAS No.

: NA

Mol F.

: C16H21N5O5

Mol W.

: 363.4

Cat No.

: SA48310

Famciclovir, Impurities

Famciclovir N7-Isomer

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CAS No.

: 131266-15-4

Mol F.

: C14H19N5O4

Mol W.

: 321.4

Cat No.

: SA48307

Famciclovir, Impurities

Famciclovir Propionyl Impurity

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CAS No.

: NA

Mol F.

: C15H21N5O4

Mol W.

: 335.4

Cat No.

: SA48318

Famciclovir, Impurities

Famciclovir USP Related Compound B

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CAS No.

: 104227-88-5

Mol F.

: C12H17N5O3

Mol W.

: 279.3

Cat No.

: SA48305

Famciclovir, Impurities

Famciclovir USP Related Compound C

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CAS No.

: 174155-70-5

Mol F.

: C12H17N5O2

Mol W.

: 263.3

Cat No.

: SA48306

Famotidine, Impurities

Famotidine

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CAS No.

: 76824-35-6

Mol F.

: C8H15N7O2S3

Mol W.

: 337.45

Cat No.

: SA40800

Famotidine, Impurities

Famotidine Chloromethyl Impurity

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CAS No.

: 81152-53-6

Mol F.

: C5H7ClN4S

Mol W.

: 190.65

Cat No.

: SA43610

Famotidine, Impurities

Famotidine Cyanoethyl Impurity

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CAS No.

: 76823-93-3

Mol F.

: C8H11N5S2

Mol W.

: 241.34

Cat No.

: SA43601

Famotidine, Impurities

Famotidine Cyanoethyl Impurity

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CAS No.

: 76823-93-3

Mol F.

: C8H11N5S2

Mol W.

: 241.34

Cat No.

: SA40812

Famotidine, Impurities

Famotidine EP Impurity A

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CAS No.

: 124646-10-2

Mol F.

: C8H14N6S2

Mol W.

: 258.37

Cat No.

: SA40801

Famotidine, Impurities

Famotidine EP Impurity A

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CAS No.

: 88061-72-7 (2HCl); 76833-47-1 (HCl); 124646-10-2 (base)

Mol F.

: C8H16Cl2N6S2

Mol W.

: 331.29

Cat No.

: SA43602

Famotidine, Impurities

Famotidine EP Impurity B

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CAS No.

: 89268-62-2

Mol F.

: C16H23N11O2S5

Mol W.

: 561.77

Cat No.

: SA40802

Famotidine, Impurities

Famotidine EP Impurity C

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CAS No.

: 76824-17-4 (HCl); 106433-44-7 (Base)

Mol F.

: C8H15ClN6O3S3 (HCl salt)

Mol W.

: 374.89

Cat No.

: SA43603

Famotidine, Impurities

Famotidine EP Impurity D

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CAS No.

: 76824-16-3

Mol F.

: C8H13N5OS2

Mol W.

: 259.35

Cat No.

: SA43604

Famotidine, Impurities

Famotidine EP Impurity E

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CAS No.

: 129083-44-9

Mol F.

: C10H14N8S4

Mol W.

: 374.53

Cat No.

: SA43609

Famotidine, Impurities

Famotidine EP Impurity F

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CAS No.

: 107880-74-0

Mol F.

: C8H12N4O2S2

Mol W.

: 260.33

Cat No.

: SA43605

Famotidine, Impurities

Famotidine EP Impurity G

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CAS No.

: 76823-97-7

Mol F.

: C9H13N7S2

Mol W.

: 283.38

Cat No.

: SA40807

Famotidine, Impurities

Famotidine EP Impurity H

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CAS No.

: 88046-01-9 (2HCl); 106649-96-1 (base)

Mol F.

: C6H12Cl2N6S2

Mol W.

: 303.24

Cat No.

: SA43611

Famotidine, Impurities

Famotidine EP Impurity I (HCl)

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CAS No.

: NA

Mol F.

: C8H15ClN6O4S3

Mol W.

: 390.89

Cat No.

: SA43606

Famotidine, Impurities

Famotidine EP Impurity J

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CAS No.

: 1798006-30-0 (HCl); 76824-14-1 (base)

Mol F.

: C9H15ClN4O2S2 (HCl)

Mol W.

: 310.82

Cat No.

: SA43607

Famotidine, Impurities

Famotidine Methoxy Impurity

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CAS No.

: 76823-94-4

Mol F.

: C9H15N5OS2

Mol W.

: 273.38

Cat No.

: SA40811

Famotidine, Impurities

Famotidine Sulfoxide

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CAS No.

: 90237-03-9

Mol F.

: C8H15N7O3S3

Mol W.

: 353.44

Cat No.

: SA43608

Febuxostat, Impurities

Febuxostat Amide Methyl Ester

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CAS No.

: 1643131-89-8

Mol F.

: C17H20N2O4S

Mol W.

: 348.42

Cat No.

: SA32007

Febuxostat, Impurities

Febuxostat Descyano Ethyl Ester

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CAS No.

: 144060-97-9

Mol F.

: C17H21NO3S

Mol W.

: 319.42

Cat No.

: SA32020

Febuxostat, Impurities

Febuxostat Descyano Impurity

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CAS No.

: 1206550-99-3

Mol F.

: C15H17NO3S

Mol W.

: 291.37

Cat No.

: SA32016

Febuxostat, Impurities

Febuxostat Dicarboxylic Acid Impurity

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CAS No.

: 1239233-87-4

Mol F.

: C16H17NO5S

Mol W.

: 335.37

Cat No.

: SA32011

Febuxostat, Impurities

Febuxostat Dithiazole Acid Impurity

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CAS No.

: 1330632-48-8

Mol F.

: C20H20N2O5S2

Mol W.

: 432.51

Cat No.

: SA32015

Fenofibrate, Impurities

Fenirofibrate

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CAS No.

: 54419-31-7

Mol F.

: C17H17ClO4

Mol W.

: 320.77

Cat No.

: SA27212