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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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Carvedilol, Impurities

Carvedilol O-Desmethyl O-Aminoethyl Impurity

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CAS No.

: 1391052-10-0

Mol F.

: C25H29N3O4

Mol W.

: 435.52

Cat No.

: SA31715

Carvedilol, Impurities

Carvedilol O-Desmethyl O-Benzyl Impurity

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CAS No.

: 72955-92-1

Mol F.

: C30H30N2O4

Mol W.

: 482.57

Cat No.

: SA31716

Carvedilol, Impurities

Carvedilol p-Benzyloxy Impurity

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CAS No.

: 887352-95-6

Mol F.

: C31H32N2O5

Mol W.

: 512.6

Cat No.

: SA31717

Carvedilol, Impurities

Carvedilol Propanediol Impurity

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CAS No.

: 123119-89-1

Mol F.

: C15H15NO3

Mol W.

: 257.28

Cat No.

: SA31718

Cefaclor, Impurities

Cefaclor EP Impurity A

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CAS No.

: 875-74-1

Mol F.

: C8H9NO2

Mol W.

: 151.16

Cat No.

: SA18706

Cefaclor, Impurities

Cefaclor EP Impurity B

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CAS No.

: 53994-69-7

Mol F.

: C7H7ClN2O3S

Mol W.

: 234.66

Cat No.

: SA18707

Cefaclor, Impurities

Cefaclor EP Impurity E

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CAS No.

: 188915-50-6

Mol F.

: C14H14ClN304S

Mol W.

: 355.8

Cat No.

: SA18702

Cefaclor, Impurities

Cefaclor Monohydrate

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CAS No.

: 70356-03-5

Mol F.

: C15H16ClN3O5S

Mol W.

: 385.82

Cat No.

: SA18700

Cefadroxil, Impurities

Cefadroxil delta-3 Isomer

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CAS No.

: 147103-94-4

Mol F.

: C16H17N3O5S

Mol W.

: 363.39

Cat No.

: SA42301

Cefadroxil, Impurities

Cefadroxil EP Impurity A

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CAS No.

: 22818-40-2

Mol F.

: C8H9NO4

Mol W.

: 168.16

Cat No.

: SA42310

Cefadroxil, Impurities

Cefadroxil EP Impurity B (7-ADCA)

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CAS No.

: 22252-43-3

Mol F.

: C8H10N2O3S

Mol W.

: 214.24

Cat No.

: SA42309

Cefadroxil, Impurities

Cefadroxil EP Impurity F

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CAS No.

: 147103-95-5

Mol F.

: C24H24N4O7S

Mol W.

: 512.53

Cat No.

: SA42306

Cefadroxil, Impurities

Cefadroxil Impurity E

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CAS No.

: 147103-93-3

Mol F.

: C11H11N3O3

Mol W.

: 233.2

Cat No.

: SA42313

Cefadroxil, Impurities

Cefadroxil Monohydrate

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CAS No.

: 66592-87-8

Mol F.

: C16H19N3O6S

Mol W.

: 381.4

Cat No.

: SA42300

Cephalexin, Impurities

Cefalexin EP Impurity G; Isocefalexine

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CAS No.

: 67308-21-8 (acid); 37050-97-8 (sodiumsalt)

Mol F.

: C16H17N3O4S

Mol W.

: 347.39

Cat No.

: SA12016

Cephalexin, Impurities

Cefalexin Monohydrate

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CAS No.

: 15686-71-2 (anhydrous); 23325-78-2 (monohydrate)

Mol F.

: C16H19N3O5S

Mol W.

: 365.4

Cat No.

: SA12015

Cefprozil, Impurities

Cefprozil

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CAS No.

: 92665-29-7

Mol F.

: C18H19N3O5S

Mol W.

: 389.43

Cat No.

: SA31900

Cefprozil, Impurities

Cefprozil EP Impurity B

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CAS No.

: 66592-87-8

Mol F.

: C16H17N3O5S.H2O

Mol W.

: 381.4

Cat No.

: SA31902

Cefprozil, Impurities

Cefprozil EP Impurity C

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CAS No.

: 147103-93-3

Mol F.

: C11H11N3O3

Mol W.

: 233.22

Cat No.

: SA31903

Cefprozil, Impurities

Cefprozil EP Impurity E

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CAS No.

: NA

Mol F.

: C26H26N4O7S

Mol W.

: 538.57000000000005

Cat No.

: SA31905

Cefprozil, Impurities

Cefprozil EP Impurity G

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CAS No.

: NA

Mol F.

: C18H21N3O6S

Mol W.

: 407.44

Cat No.

: SA31907

Cefprozil, Impurities

Cefprozil EP Impurity I

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CAS No.

: NA

Mol F.

: C18H21N3O6S

Mol W.

: 407.44

Cat No.

: SA31909

Cefprozil, Impurities

Cefprozil EP Impurity J

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CAS No.

Mol F.

: C26H26N4O7S

Mol W.

: 538.57

Cat No.

: SA31910

Cefprozil, Impurities

Cefprozil EP Impurity K

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CAS No.

: NA

Mol F.

: C18H19N3O5S

Mol W.

: 389.43

Cat No.

: SA31911

Cefprozil, Impurities

Cefprozil EP Impurity L

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CAS No.

: 203007-73-2

Mol F.

: C10H13NO4

Mol W.

: 211.21

Cat No.

: SA31912

Cefprozil, Impurities

Cefprozil EP Impurity N

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CAS No.

: 1605314-85-9

Mol F.

: C21H23N3O7S

Mol W.

: 461.49

Cat No.

: SA31914

Celecoxib, Impurities

Celecoxib

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CAS No.

: 169590-42-5

Mol F.

: C₁₇H₁₄F₃N₃O₂S

Mol W.

: 381.37

Cat No.

: SA11300

Celecoxib, Impurities

Celecoxib Carboxylic Acid

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CAS No.

: 170571-01-4

Mol F.

: C₁₇H₁₂F₃N₃O₄S

Mol W.

: 411.36

Cat No.

: SA11307

Celecoxib, Impurities

Celecoxib EP Impurity B

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CAS No.

: 331943-04-5

Mol F.

: C17H14F3N3O2S

Mol W.

: 381.37

Cat No.

: SA11306

Celecoxib, Impurities

Celecoxib Methyl Ester

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CAS No.

: 1189893-75-1

Mol F.

: C₁₈H₁₄F₃N₃O₄S

Mol W.

: 425.38

Cat No.

: SA11308

Celiprolol, Impurities

Celiprolol

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CAS No.

: 56980-93-6 (Free Base); 57470-78-7 (HCl salt)

Mol F.

: C20H34ClN3O4

Mol W.

: 379.49

Cat No.

: SA38500

Celiprolol, Impurities

Celiprolol EP Impurity A

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CAS No.

: 56980-94-0

Mol F.

: C15H24N2O3

Mol W.

: 280.36

Cat No.

: SA38501

Celiprolol, Impurities

Celiprolol EP Impurity D

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CAS No.

: 56980-93-9

Mol F.

: C20H33N3O4

Mol W.

: 379.49

Cat No.

: SA38504

Celiprolol, Impurities

Celiprolol EP Impurity E

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CAS No.

: NA

Mol F.

: C36H55N5O8

Mol W.

: 685.85

Cat No.

: SA38505

Celiprolol, Impurities

Celiprolol EP Impurity F

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CAS No.

: 79881-89-3

Mol F.

: C13H18N2O3

Mol W.

: 250.29

Cat No.

: SA38506

Celiprolol, Impurities

Celiprolol EP Impurity G

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CAS No.

: 56980-98-4

Mol F.

: C16H22N2O4

Mol W.

: 306.36

Cat No.

: SA38507

Celiprolol, Impurities

Celiprolol EP Impurity H

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CAS No.

: 85045-98-3

Mol F.

: C16H23BrN2O4

Mol W.

: 387.27

Cat No.

: SA38508

Celiprolol, Impurities

Celiprolol EP Impurity I

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CAS No.

: NA

Mol F.

: C15H22N2O3

Mol W.

: 278.35

Cat No.

: SA38509

Cephalexin, Impurities

Cephalexin Diketopiperazine

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CAS No.

: 59865-11-1

Mol F.

: C16H17N3O4S

Mol W.

: 347.39

Cat No.

: SA12006

Cephalexin, Impurities

Cephalexin Ethyl homolog

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CAS No.

Mol F.

: C17H19N3O4S

Mol W.

: 361.42

Cat No.

: SA12013

Cetirizine, Impurities

Cetirizine (1-Methyl)-Methylene Dimer Impurity

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CAS No.

Mol F.

: C40H48Cl2N4O2

Mol W.

: 687.74

Cat No.

: SA13516

Cetirizine, Impurities

Cetirizine (2,2-Dimethyl-1,3-dioxolan-4-yl)methyl ester

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CAS No.

Mol F.

: C₂₇H₃₅ClN₂O₅

Mol W.

: 503.03

Cat No.

: SA13508

Cetirizine, Impurities

Cetirizine Allyl Ester Dihydrochloride

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CAS No.

Mol F.

: C₂₄H₃₁Cl₃N₂O₃

Mol W.

: 501.87

Cat No.

: SA13507

Cetirizine, Impurities

Cetirizine Amide

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CAS No.

: 83881-37-2

Mol F.

: C₂₁H₂₆ClN₃O₂

Mol W.

: 387.9

Cat No.

: SA13510

Cetirizine, Impurities

Cetirizine Dihydrochloride

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CAS No.

: 83881-52-1

Mol F.

: C21H27Cl3N2O3

Mol W.

: 461.81

Cat No.

: SA13500

Cetirizine, Impurities, Nitrosamine

Cetirizine dihydrochloride (nitrosamine of imp A) nitrosamine impurity

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CAS No.

: NA

Mol F.

: C17H18ClN3O

Mol W.

: 315.8

Cat No.

: SA44610

Cetirizine, Impurities

Cetirizine Ethyl Ester

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CAS No.

: 246870-46-2

Mol F.

: C₂₃H₂₉ClN₂O₃

Mol W.

: 416.94

Cat No.

: SA13511

Cetirizine, Impurities

Cetirizine Glycerol Ester Dihydrochloride (Mixture of Diastereomers)

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CAS No.

Mol F.

: C₂₄H₃₃Cl₃N₂O₅

Mol W.

: 535.89

Cat No.

: SA13506

Cetirizine, Impurities

Cetirizine Glycol Ester Dihydrochloride

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CAS No.

Mol F.

: C₂₄H₃₁ClN₂O₄

Mol W.

: 446.97

Cat No.

: SA13504

Cetirizine, Impurities

Cetirizine N-(2-Ethoxyacetate)

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CAS No.

Mol F.

: C₂₅H₃₁ClN₂O₆

Mol W.

: 490.98

Cat No.

: SA13505