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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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Clarithromycin, Impurities

Clarithromycin EP Impurity B

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CAS No.

: 299409-85-1

Mol F.

: C37H67NO13

Mol W.

: 733.92

Cat No.

: SA17208

Clarithromycin, Impurities

Clarithromycin EP Impurity C

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CAS No.

: 127253-06-9

Mol F.

: C38H70N2O13

Mol W.

: 762.97

Cat No.

: SA17209

Clarithromycin, Impurities

Clarithromycin EP Impurity D

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CAS No.

: 101666-68-6

Mol F.

: C37H67NO13

Mol W.

: 733.93

Cat No.

: SA17210

Clarithromycin, Impurities

Clarithromycin EP Impurity E

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CAS No.

: 81103-14-2

Mol F.

: C39H71NO13

Mol W.

: 761.98

Cat No.

: SA17211

Clarithromycin, Impurities

Clarithromycin EP Impurity G

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CAS No.

: 127182-44-9

Mol F.

: C39H72N2O13

Mol W.

: 777

Cat No.

: SA17213

Clarithromycin, Impurities

Clarithromycin EP Impurity I

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CAS No.

: 118058-74-5

Mol F.

: C30H55NO10

Mol W.

: 589.76

Cat No.

: SA17215

Clarithromycin, Impurities

Clarithromycin EP Impurity J

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CAS No.

: 13127-18-9

Mol F.

: C37H68N2O13

Mol W.

: 748.94

Cat No.

: SA17216

Clindamycin, Impurities

Clindamycin 2-Phosphate Sulfoxide Isomer A

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CAS No.

: 887402-21-3

Mol F.

: C18H34ClN2O9PS

Mol W.

: 520.96

Cat No.

: SA29728

Clindamycin, Impurities

Clindamycin 2-Phosphate Sulfoxide Isomer B

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CAS No.

: 887402-20-2

Mol F.

: C18H34ClN2O9PS

Mol W.

: 520.96

Cat No.

: SA29729

Clindamycin, Impurities

Clindamycin 3-Phosphate

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CAS No.

: 28708-34-1

Mol F.

: C18H34ClN2O8PS

Mol W.

: 505.0

Cat No.

: SA29719

Clindamycin, Impurities

Clindamycin 4-Phosphate

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CAS No.

: NA

Mol F.

: C18H34ClN2O8PS

Mol W.

: 505.0

Cat No.

: SA29720

Clindamycin, Impurities

Clindamycin Cyclomonophosphate

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CAS No.

: NA

Mol F.

: C₁₈H₃₂ClN₂O₇PS

Mol W.

: 486.95

Cat No.

: SA29704

Clindamycin, Impurities

Clindamycin Diastereoisomer 2-phosphate Impurity

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CAS No.

: 1800297-62-4

Mol F.

: C18H34ClN2O8PS

Mol W.

: 505.0

Cat No.

: SA29730

Clindamycin, Impurities

Clindamycin EP Impurity B

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CAS No.

: 18323-43-8

Mol F.

: C₁₇H₃₁ClN₂O₅S

Mol W.

: 410.96

Cat No.

: SA29706

Clindamycin, Impurities

Clindamycin Hydrochloride

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CAS No.

: 21462-39-5

Mol F.

: C₁₈H₃₃ClN₂O₅S•HCl

Mol W.

: 424.98

Cat No.

: SA29701

Clindamycin, Impurities

Clindamycin Laurate

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CAS No.

: 763863-68-9

Mol F.

: C₃₀H₅₅ClN₂O₇S

Mol W.

: 607.29

Cat No.

: SA29703

Clindamycin, Impurities

Clindamycin Palmitate Hydrochloride

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CAS No.

Mol F.

: C34H63ClN2O6S·HCl

Mol W.

: 699.85

Cat No.

: SA29715

Clindamycin, Impurities

Clindamycin Phosphate EP Impurity B

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CAS No.

: 54887-31-9

Mol F.

: C17H32ClN2O8PS

Mol W.

: 490.94

Cat No.

: SA29724

Clindamycin, Impurities

Clindamycin Phosphate EP Impurity F

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CAS No.

: 27480-30-4

Mol F.

: C18H35N2O9PS

Mol W.

: 486.5

Cat No.

: SA29708

Clindamycin, Impurities

Clindamycin Phosphate EP Impurity G

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CAS No.

: NA

Mol F.

: C18H33N2O8PS

Mol W.

: 468.5

Cat No.

: SA29723

Clindamycin, Impurities

Clindamycin Phosphate EP Impurity H

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CAS No.

: NA

Mol F.

: C18H35ClN2O11P2S

Mol W.

: 584.94

Cat No.

: SA29725

Clindamycin, Impurities

Clindamycin Phosphate EP Impurity I

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CAS No.

: NA

Mol F.

: C18H35ClN2O11P2S

Mol W.

: 584.9

Cat No.

: SA29726

Clindamycin, Impurities

Clindamycin Phosphate EP Impurity J

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CAS No.

: 1309349-64-1

Mol F.

: C18H32ClN2O8PS

Mol W.

: 502.9

Cat No.

: SA29721

Clindamycin, Impurities

Clindamycin Phosphate EP Impurity K

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CAS No.

: NA

Mol F.

: C36H66Cl2N4O15P2S2

Mol W.

: 992.0

Cat No.

: SA29722

Clindamycin, Impurities

Clindamycin Phosphate EP Impurity L

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CAS No.

: 620181-05-7

Mol F.

: C18H34ClN2O8PS

Mol W.

: 504.96

Cat No.

: SA29727

Clobetasol Propionate, Impurities

Clobetasol Propionate

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CAS No.

: 25122-46-7

Mol F.

: C25H32ClFO5

Mol W.

: 466.97

Cat No.

: SA17112

Clobetasol Propionate, Impurities

Clobetasol Propionate EP Impurity A

$155.00 25 mg

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CAS No.

: 5534-13-4

Mol F.

: C25H33FO6

Mol W.

: 448.52

Cat No.

: SA17101

Clobetasol Propionate, Impurities

Clobetasol Propionate EP Impurity E

$1,195.00 25 mg

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CAS No.

Mol F.

: C25H33ClO4

Mol W.

: 432.98

Cat No.

: SA17105

Clobetasol Propionate, Impurities

Clobetasol Propionate EP Impurity F

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CAS No.

: 2412496-00-3

Mol F.

: C22H27FO4

Mol W.

: 374.45

Cat No.

: SA17106

Clobetasol Propionate, Impurities

Clobetasol Propionate EP Impurity H

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CAS No.

: 4351-48-8

Mol F.

: C25H33FO5

Mol W.

: 432.52

Cat No.

: SA17108

Clobetasol Propionate, Impurities

Clobetasol Propionate EP Impurity K

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CAS No.

: 75883-07-7

Mol F.

: C25H33FO6

Mol W.

: 448.52

Cat No.

: SA17111

Clomifene, Impurities

Clomifene Dimer

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CAS No.

: NA

Mol F.

: C46H41Cl2NO2

Mol W.

: 710.72

Cat No.

: SA21709

Clomifene, Impurities

Clomifene EP Impurity A

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CAS No.

: 19957-52-9 (Base free); 97800-41-4 (HCl salt)

Mol F.

: C26H29NO

Mol W.

: 371.51

Cat No.

: SA21702

Clomifene, Impurities

Clomifene EP Impurity B

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CAS No.

: 796-77-0

Mol F.

: C19H23NO2

Mol W.

: 297.39

Cat No.

: SA21700

Clomifene, Impurities

Clomifene EP Impurity C

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CAS No.

: 5635-70-1

Mol F.

: C26H29NO2

Mol W.

: 387.51

Cat No.

: SA21701

Clomifene, Impurities

Clomifene EP Impurity D

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CAS No.

: 1391054-64-0

Mol F.

: C38H46N2O3

Mol W.

: 578.78

Cat No.

: SA21704

Clomifene, Impurities

Clomifene EP Impurity E (Mixture of Z and E Isomers)

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CAS No.

: 117884-83-0

Mol F.

: C26H27Cl2NO

Mol W.

: 440.4

Cat No.

: SA21705

Clomifene, Impurities

Clomifene EP Impurity F ((Mixture of Z and E Isomers)

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CAS No.

: 14158-75-9

Mol F.

: C26H27Cl2NO

Mol W.

: 440.4

Cat No.

: SA21713

Clomifene, Impurities

Clomifene N-Oxide impurity

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CAS No.

: 97642-74-5

Mol F.

: C26H28ClNO2

Mol W.

: 421.96

Cat No.

: SA21703

Clomifene, Impurities

Clomifene Z Isomers

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CAS No.

: 7619-53-6

Mol F.

: C26H28ClNO

Mol W.

: 405.96

Cat No.

: SA21714

Clomipramine, Impurities

Clomipramine

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CAS No.

: 303-49-1

Mol F.

: C19H23ClN2

Mol W.

: 314.85

Cat No.

: SA33700

Clonidine, Impurities

Clonidine

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CAS No.

: 4205-90-7 (freebase); 4205-91-8 (HCl)

Mol F.

: C9H9Cl2N3

Mol W.

: 230.09

Cat No.

: SA42500

Clonidine, Impurities

Clonidine Dimer Impurity

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CAS No.

: 2519452-56-1

Mol F.

: C20H20Cl4N6

Mol W.

: 486.23

Cat No.

: SA42501

Clonidine, Impurities

Clonidine EP Impurity A

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CAS No.

: 5391-39-9

Mol F.

: C5H8N2O2

Mol W.

: 128.13

Cat No.

: SA42504

Clonidine, Impurities

Clonidine EP Impurity C

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CAS No.

: 608-31-1

Mol F.

: C6H6Cl2N

Mol W.

: 162.02

Cat No.

: SA42502

Clonixin, Impurities

Clonixin

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CAS No.

: 17737-65-4

Mol F.

: C13H11ClN2O2

Mol W.

: 262.69

Cat No.

: SA38000

Clopidogrel, Impurities

Clopidogrel

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CAS No.

: 113665-84-2

Mol F.

: C16H16ClNO2S

Mol W.

: 321.8

Cat No.

: SA54000

Clotrimazole, Impurities

Clotrimazole EP Impurity C

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CAS No.

: 42074-68-0

Mol F.

: C19H14Cl2

Mol W.

: 313.22

Cat No.

: SA11612

Clotrimazole, Impurities

Clotrimazole EP Impurity D

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CAS No.

: 288-32-4

Mol F.

: C3H4N2

Mol W.

: 68.08

Cat No.

: SA11613

Clotrimazole, Impurities

Clotrimazole EP Impurity F

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CAS No.

: 15469-97-3

Mol F.

: C22H18N2

Mol W.

: 310.39

Cat No.

: SA11615