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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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Ciprofloxacin, Impurities

Ciprofloxacin EP Impurity A

$75.00 25 mg

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CAS No.

: 86393-33-1

Mol F.

: C13H9ClFNO3

Mol W.

: 281.67

Cat No.

: SA34701

Ciprofloxacin, Impurities

Ciprofloxacin EP impurity A

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CAS No.

: 86393-33-1

Mol F.

: C13H9ClFNO3

Mol W.

: 281.67

Cat No.

: SA42001

Ciprofloxacin, Impurities

Ciprofloxacin EP impurity B

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CAS No.

: NA

Mol F.

: C18H21N3O3

Mol W.

: 327.38

Cat No.

: SA42003

Ciprofloxacin, Impurities

Ciprofloxacin EP Impurity B

$145.00 25 mg

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CAS No.

: 93107-11-0

Mol F.

: C17H20ClN3O3

Mol W.

: 349.81

Cat No.

: SA34702

Ciprofloxacin, Impurities

Ciprofloxacin EP Impurity C

$155.00 25 mg

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CAS No.

: 103222-12-4; 528851-31-2 (HCl)

Mol F.

: C15H16FN3O3

Mol W.

: 305.3

Cat No.

: SA34703

Ciprofloxacin, Impurities

Ciprofloxacin EP impurity C

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CAS No.

: 528851-31-2

Mol F.

: C15H16FN3O

Mol W.

: 305.3

Cat No.

: SA42002

Ciprofloxacin, Impurities

Ciprofloxacin EP impurity D

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CAS No.

: NA

Mol F.

: C17H18ClN3O3

Mol W.

: 347.79

Cat No.

: SA42004

Ciprofloxacin, Impurities

Ciprofloxacin EP Impurity D

$255.00 25 mg

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CAS No.

: 133210-96-5; 526204-10-4 (HCl salt)

Mol F.

: C17H18ClN3O3

Mol W.

: 347.8

Cat No.

: SA34704

Ciprofloxacin, Impurities

Ciprofloxacin EP impurity E

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CAS No.

: NA

Mol F.

: C16H18FN3O3

Mol W.

: 287.33

Cat No.

: SA42005

Ciprofloxacin, Impurities

Ciprofloxacin EP impurity F

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CAS No.

: NA

Mol F.

: C17H19N3O4

Mol W.

: 329.35

Cat No.

: SA42006

Ciprofloxacin, Impurities

Ciprofloxacin EP Impurity F

$255.00 25 mg

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CAS No.

: 226903-07-7

Mol F.

: C17H19N3O4

Mol W.

: 329.35

Cat No.

: SA34706

Ciprofloxacin, Impurities

Ciprofloxacin Lactam

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CAS No.

: 103237-52-1

Mol F.

: C17H16FN3O4

Mol W.

: 345.33

Cat No.

: SA34709

Ciprofloxacin, Impurities

Ciprofloxacin N-Formyl Impurity

$175.00 25 mg

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CAS No.

: 93594-39-9

Mol F.

: C18H18FN3O4

Mol W.

: 359.35

Cat No.

: SA34710

Ciprofloxacin, Impurities

Ciprofloxacin N-Oxide

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CAS No.

: 860033-22-3

Mol F.

: C17H18FN3O4

Mol W.

: 347.34

Cat No.

: SA42007

Ciprofloxacin, Impurities

Ciprofloxacin Piperazinyl-N4-sulfate

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CAS No.

: 105093-21-8

Mol F.

: C17H18FN3O6S

Mol W.

: 411.4

Cat No.

: SA42008

Carbamazepine, Impurities

Cis-10,11-Dihydroxy-10,11-dihydrocarbamazepine

$395.00 25 mg

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CAS No.

: 58955-94-5

Mol F.

: C15H14N2O3

Mol W.

: 270.28

Cat No.

: SA20317

Impurities, Olmesartan Medoxomil

Cis-4,5-Dichloro-4,5-dimethyl-1,3-dioxolan-2-one

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CAS No.

: 129482-56-0

Mol F.

: C5H6Cl2O3

Mol W.

: 185.01

Cat No.

: SA17707

Emtricitabine, Impurities

cis-L-Menthol-5-(acetyloxy)-1,3-oxathiolane-2-carboxylate

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CAS No.

Mol F.

: C16H26O5S

Mol W.

: 330.44

Cat No.

: SA22910

Citalopram, Impurities

Citalopram Descyano Impurity | CAS : 390817-87-5

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CAS No.

: 390817-87-5

Mol F.

: C19H22FNO

Mol W.

: 299.38

Cat No.

: SA17025

Citalopram, Impurities

Citalopram EP Impurity E

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CAS No.

: 1332724-08-9 (HBr); 64169-45-5 (Base); 64169-46-6 (Oxalate)

Mol F.

: C19H22BrClFNO

Mol W.

: 414.74

Cat No.

: SA17009

Citalopram, Impurities

Citalopram EP Impurity F; Citalopram Related Compound H

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CAS No.

: 64169-39-7 (Base); 479065-02-6 (HBr Salt)

Mol F.

: C19H21BrFNO (Base), C21H23BrFNO5 (Oxalate Salt)

Mol W.

: 378.28,468.31(OxalateSalt)

Cat No.

: SA17010

Citalopram, Impurities

Citalopram HBr

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CAS No.

: 59729-32-7

Mol F.

: C20H26BrFN2O

Mol W.

: 409.34

Cat No.

: SA17012

Citalopram, Impurities

Citalopram HCl

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CAS No.

: 85118-27-0

Mol F.

: C20H22ClFN2O

Mol W.

: 360.85

Cat No.

: SA17013

Citalopram, Impurities

Citalopram R-Isomer

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CAS No.

: 219861-53-7

Mol F.

: C22H27FN2O5

Mol W.

: 418.46

Cat No.

: SA17014

Citalopram, Impurities

Citalopram USP RC F; Citalopram Related Compound F

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CAS No.

: 55011-89-7

Mol F.

: C18H22ClN

Mol W.

: 287.83

Cat No.

: SA17017

Clarithromycin, Impurities

Clarithromycin

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CAS No.

: 81103-11-9

Mol F.

: C₃₈H₆₉NO₁₃

Mol W.

: 747.95

Cat No.

: SA17200

Clarithromycin, Impurities

Clarithromycin (9E)-O-Methyloxime

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CAS No.

: 127182-44-9

Mol F.

: C₃₉H₇₂N₂O₁₃

Mol W.

: 776.99

Cat No.

: SA17206

Clarithromycin, Impurities

Clarithromycin (9Z)-Oxime

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CAS No.

: 127253-05-8

Mol F.

: C₃₈H₇₀N₂O₁₃

Mol W.

: 762.97

Cat No.

: SA17205

Clarithromycin, Impurities

Clarithromycin EP Impurity A

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CAS No.

: 124412-58-4

Mol F.

: C38H69NO14

Mol W.

: 763.95

Cat No.

: SA17207

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 Cyclomonophosphate

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CAS No.

: NA

Mol F.

: C₁₈H₃₂ClN₂O₇PS

Mol W.

: 486.95

Cat No.

: SA29704

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 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 L

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CAS No.

: 620181-05-7

Mol F.

: C18H34ClN2O8PS

Mol W.

: 504.96

Cat No.

: SA29709

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