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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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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

Cefepime, Impurities

Cefepime

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CAS No.

: 88040-23-7

Mol F.

: C19H24N6O5S2

Mol W.

: 480.56

Cat No.

: SA59000

Cefepime, Impurities

Cefepime EP Impurity A

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CAS No.

: 97164-57-3

Mol F.

: C19H24N6O5S2

Mol W.

: 485.56

Cat No.

: SA59001

Cefepime, Impurities

Cefepime EP Impurity B

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CAS No.

: 2923899-40-3

Mol F.

: C25H29N9O7S3

Mol W.

: 663.76

Cat No.

: SA59002

Cefepime, Impurities

Cefepime EP Impurity C

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CAS No.

: 104301-63-5

Mol F.

: C8H10N4O3S

Mol W.

: 242.26

Cat No.

: SA59003

Cefepime, Impurities

Cefepime EP Impurity D

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CAS No.

: 65872-41-5

Mol F.

: C6H7N3O3S

Mol W.

: 201.2

Cat No.

: SA59004

Cefixime, Impurities

Cefixime

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CAS No.

: 79350-37-1

Mol F.

: C16H15N5O7S2

Mol W.

: 453.4

Cat No.

: SA59100

Cefixime, Impurities

Cefixime EP Impurity A

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CAS No.

: 1614255-90-1

Mol F.

: C16H17N5O8S2

Mol W.

: 471.5

Cat No.

: SA59101

Cefixime, Impurities

Cefixime EP Impurity B

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CAS No.

: NA

Mol F.

: C15H17N5O6S2

Mol W.

: 427.5

Cat No.

: SA59102

Cefixime, Impurities

Cefixime EP Impurity C

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CAS No.

: 108691-83-4

Mol F.

: C16H15N5O7S2

Mol W.

: 453.4

Cat No.

: SA59103

Cefixime, Impurities

Cefixime EP Impurity D

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CAS No.

: 97164-56-2

Mol F.

: C16H15N5O7S2

Mol W.

: 453.4

Cat No.

: SA59104

Cefoperazone, Impurities

Cefoperazone

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CAS No.

: 62893-19-0

Mol F.

: C25H27N9O8S2

Mol W.

: 645.7

Cat No.

: SA59200

Cefoperazone, Impurities

Cefoperazone EP Impurity A

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CAS No.

: 73240-08-1

Mol F.

: C23H23N5O8S

Mol W.

: 529.5

Cat No.

: SA59201

Cefoperazone, Impurities

Cefoperazone EP Impurity B

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CAS No.

: 711598-76-4

Mol F.

: C25H27N9O8S2

Mol W.

: 645.7

Cat No.

: SA59202

Cefoperazone, Impurities

Cefoperazone EP Impurity C

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CAS No.

: 13183-79-4

Mol F.

: C2H4N4S

Mol W.

: 116.2

Cat No.

: SA59203

Cefoperazone, Impurities

Cefoperazone EP Impurity D

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CAS No.

: 37539-03-0

Mol F.

: C10H11N5O3S2

Mol W.

: 313.4

Cat No.

: SA59204

Cefoxitin, Impurities

Cefoxitin

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CAS No.

: 35607-66-0

Mol F.

: C16H17N3O7S2

Mol W.

: 427.45

Cat No.

: SA59300

Cefoxitin, Impurities

Cefoxitin EP Impurity H

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CAS No.

: 37051-05-1

Mol F.

: C16H17N3O7S2

Mol W.

: 427.45

Cat No.

: SA59301

Cefoxitin, Impurities

Cefoxitin EP Impurity J

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CAS No.

: 1422023-33-3

Mol F.

: C15H14N2O5S2

Mol W.

: 366.41

Cat No.

: SA59302

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

Ceftazidime, Impurities

Ceftazidime EP Impurity A

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CAS No.

: 1000980-60-8

Mol F.

: C22H22N6O7S2

Mol W.

: 546.6

Cat No.

: SA58600

Ceftazidime, Impurities

Ceftazidime EP Impurity B

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CAS No.

: 97148-38-4

Mol F.

: C22H22N6O7S2

Mol W.

: 546.6

Cat No.

: SA58601

Ceftazidime, Impurities

Ceftazidime EP Impurity C

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CAS No.

: 3432-88-0

Mol F.

: C13H13N3O3S

Mol W.

: 291.3

Cat No.

: SA58603

Ceftazidime, Impurities

Ceftazidime EP Impurity E

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CAS No.

: 102772-66-7

Mol F.

: C26H30N6O7S2

Mol W.

: 602.7

Cat No.

: SA58604

Ceftazidime, Impurities

Ceftazidime EP Impurity G

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CAS No.

: 194241-83-3

Mol F.

: C11H14N4O5S

Mol W.

: 314.3

Cat No.

: SA58602

Ceftazidime, Impurities

Ceftazidime EP Impurity H

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CAS No.

: 1354396-23-8

Mol F.

: C23H24N6O7S2

Mol W.

: 560.6

Cat No.

: SA58605

Ceftriaxone, Impurities

Ceftriaxone

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CAS No.

: 73384-59-5

Mol F.

: C18H18N8O7S3

Mol W.

: 554.6

Cat No.

: SA59400

Ceftriaxone, Impurities

Ceftriaxone EP Impurity A

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CAS No.

: 92143-31-2

Mol F.

: C18H18N8O7S3

Mol W.

: 554.6

Cat No.

: SA59401

Ceftriaxone, Impurities

Ceftriaxone EP Impurity B

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CAS No.

: 66340-33-8

Mol F.

: C14H13N5O5S2

Mol W.

: 395.4

Cat No.

: SA59402

Ceftriaxone, Impurities

Ceftriaxone EP Impurity C

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CAS No.

: 58909-39-0

Mol F.

: C4H5N3O2S

Mol W.

: 159.2

Cat No.

: SA59403

Ceftriaxone, Impurities

Ceftriaxone EP Impurity D

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CAS No.

: 80756-85-0

Mol F.

: C13H10N4O2S3

Mol W.

: 350.4

Cat No.

: SA59404

Ceftriaxone, Impurities

Ceftriaxone EP Impurity E

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CAS No.

: 58909-56-1

Mol F.

: C12H13N5O5S2

Mol W.

: 371.4

Cat No.

: SA59405

Cefuroxime, Impurities

Cefuroxime

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CAS No.

: 55268-75-2

Mol F.

: C16H16N4O8S

Mol W.

: 424.4

Cat No.

: SA59500

Cefuroxime, Impurities

Cefuroxime EP Impurity A

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CAS No.

: 56271-94-4

Mol F.

: C15H15N3O7S

Mol W.

: 381.4

Cat No.

: SA59501

Cefuroxime, Impurities

Cefuroxime EP Impurity B

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CAS No.

: 39685-31-9

Mol F.

: C17H17N3O8S

Mol W.

: 423.4

Cat No.

: SA59502

Cefuroxime, Impurities

Cefuroxime EP Impurity E

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CAS No.

: 97232-97-8

Mol F.

: C16H16N4O8S

Mol W.

: 424.4

Cat No.

: SA59503

Cefuroxime, Impurities

Cefuroxime EP Impurity H

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CAS No.

: 947723-87-7

Mol F.

: C15H13N3O6S

Mol W.

: 363.3

Cat No.

: SA59504

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