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Impurities

SynThink is a producer and supplier of a number of pharmaceutical Reference Standards (Impurity Standards) which are required for pharmaceutical companies to study quality, stability and biological safety of pharmaceutical products. Many API Impurities are available in our stock.

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Citalopram, Impurities

Citalopram HCl

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Out of Stock

CAS No.

: 85118-27-0

Mol F.

: C20H22ClFN2O

Mol W.

: 360.85

Cat No.

: SA17013

Citalopram, Impurities

Citalopram R-Isomer

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Out of Stock

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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Out of Stock

CAS No.

: 55011-89-7

Mol F.

: C18H22ClN

Mol W.

: 287.83

Cat No.

: SA17017

Clarithromycin, Impurities

Clarithromycin

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Out of Stock

CAS No.

: 81103-11-9

Mol F.

: C₃₈H₆₉NO₁₃

Mol W.

: 747.95

Cat No.

: SA17200

Clarithromycin, Impurities

Clarithromycin (9E)-O-Methyloxime

Please enquire for price & pack size

Out of Stock

CAS No.

: 127182-44-9

Mol F.

: C₃₉H₇₂N₂O₁₃

Mol W.

: 776.99

Cat No.

: SA17206

Clarithromycin, Impurities

Clarithromycin (9Z)-Oxime

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Out of Stock

CAS No.

: 127253-05-8

Mol F.

: C₃₈H₇₀N₂O₁₃

Mol W.

: 762.97

Cat No.

: SA17205

Clarithromycin, Impurities

Clarithromycin EP Impurity A

Please enquire for price & pack size

Out of Stock

CAS No.

: 124412-58-4

Mol F.

: C38H69NO14

Mol W.

: 763.95

Cat No.

: SA17207

Clarithromycin, Impurities

Clarithromycin EP Impurity B

Please enquire for price & pack size

Out of Stock

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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Out of Stock

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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Out of Stock

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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Out of Stock

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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Out of Stock

CAS No.

: 127182-44-9

Mol F.

: C39H72N2O13

Mol W.

: 777

Cat No.

: SA17213

Clarithromycin, Impurities

Clarithromycin EP Impurity I

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Out of Stock

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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Out of Stock

CAS No.

: 13127-18-9

Mol F.

: C37H68N2O13

Mol W.

: 748.94

Cat No.

: SA17216

Clindamycin, Impurities

Clindamycin Cyclomonophosphate

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Out of Stock

CAS No.

: NA

Mol F.

: C₁₈H₃₂ClN₂O₇PS

Mol W.

: 486.95

Cat No.

: SA29704

Clindamycin, Impurities

Clindamycin EP Impurity B

Please enquire for price & pack size

Out of Stock

CAS No.

: 18323-43-8

Mol F.

: C₁₇H₃₁ClN₂O₅S

Mol W.

: 410.96

Cat No.

: SA29706

Clindamycin, Impurities

Clindamycin Hydrochloride

Please enquire for price & pack size

Out of Stock

CAS No.

: 21462-39-5

Mol F.

: C₁₈H₃₃ClN₂O₅S•HCl

Mol W.

: 424.98

Cat No.

: SA29701

Clindamycin, Impurities

Clindamycin Laurate

Please enquire for price & pack size

Out of Stock

CAS No.

: 763863-68-9

Mol F.

: C₃₀H₅₅ClN₂O₇S

Mol W.

: 607.29

Cat No.

: SA29703

Clindamycin, Impurities

Clindamycin Palmitate Hydrochloride

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C34H63ClN2O6S·HCl

Mol W.

: 699.85

Cat No.

: SA29715

Clindamycin, Impurities

Clindamycin Phosphate EP Impurity F

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Out of Stock

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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Out of Stock

CAS No.

: 620181-05-7

Mol F.

: C18H34ClN2O8PS

Mol W.

: 504.96

Cat No.

: SA29709

Clobetasol Propionate, Impurities

Clobetasol Propionate

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Out of Stock

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

Out of Stock

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

Out of Stock

CAS No.

Mol F.

: C25H33ClO4

Mol W.

: 432.98

Cat No.

: SA17105

Clobetasol Propionate, Impurities

Clobetasol Propionate EP Impurity F

Please enquire for price & pack size

Out of Stock

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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Out of Stock

CAS No.

: 4351-48-8

Mol F.

: C25H33FO5

Mol W.

: 432.52

Cat No.

: SA17108

Clobetasol Propionate, Impurities

Clobetasol Propionate EP Impurity K

Please enquire for price & pack size

Out of Stock

CAS No.

: 75883-07-7

Mol F.

: C25H33FO6

Mol W.

: 448.52

Cat No.

: SA17111

Clomifene, Impurities

Clomifene Dimer

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C46H41Cl2NO2

Mol W.

: 710.72

Cat No.

: SA21709

Clomifene, Impurities

Clomifene EP Impurity A

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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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Out of Stock

CAS No.

: 5635-70-1

Mol F.

: C26H29NO2

Mol W.

: 387.51

Cat No.

: SA21701

Clomifene, Impurities

Clomifene EP Impurity D

Please enquire for price & pack size

Out of Stock

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)

Please enquire for price & pack size

Out of Stock

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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Out of Stock

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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Out of Stock

CAS No.

: 97642-74-5

Mol F.

: C26H28ClNO2

Mol W.

: 421.96

Cat No.

: SA21703

Clomifene, Impurities

Clomifene Z Isomers

Please enquire for price & pack size

Out of Stock

CAS No.

: 7619-53-6

Mol F.

: C26H28ClNO

Mol W.

: 405.96

Cat No.

: SA21714

Clomipramine, Impurities

Clomipramine

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Out of Stock

CAS No.

: 303-49-1

Mol F.

: C19H23ClN2

Mol W.

: 314.85

Cat No.

: SA33700

Clonidine, Impurities

Clonidine

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

CAS No.

: 2519452-56-1

Mol F.

: C20H20Cl4N6

Mol W.

: 486.23

Cat No.

: SA42501

Clonidine, Impurities

Clonidine EP Impurity A

Please enquire for price & pack size

Out of Stock

CAS No.

: 5391-39-9

Mol F.

: C5H8N2O2

Mol W.

: 128.13

Cat No.

: SA42504

Clonidine, Impurities

Clonidine EP Impurity C

Please enquire for price & pack size

Out of Stock

CAS No.

: 608-31-1

Mol F.

: C6H6Cl2N

Mol W.

: 162.02

Cat No.

: SA42502

Clonixin, Impurities

Clonixin

Please enquire for price & pack size

Out of Stock

CAS No.

: 17737-65-4

Mol F.

: C13H11ClN2O2

Mol W.

: 262.69

Cat No.

: SA38000

Clotrimazole, Impurities

Clotrimazole EP Impurity C

Please enquire for price & pack size

Out of Stock

CAS No.

: 42074-68-0

Mol F.

: C19H14Cl2

Mol W.

: 313.22

Cat No.

: SA11612

Clotrimazole, Impurities

Clotrimazole EP Impurity D

Please enquire for price & pack size

Out of Stock

CAS No.

: 288-32-4

Mol F.

: C3H4N2

Mol W.

: 68.08

Cat No.

: SA11613

Clotrimazole, Impurities

Clotrimazole EP Impurity F

Please enquire for price & pack size

Out of Stock

CAS No.

: 15469-97-3

Mol F.

: C22H18N2

Mol W.

: 310.39

Cat No.

: SA11615

Aciclovir, Impurities

CNP ( 5-chloro-2-nitro diphenylamine)

Please enquire for price & pack size

Out of Stock

CAS No.

: 25781-92-4

Mol F.

: C12H9ClN2O2

Mol W.

: 248.67

Cat No.

: SA21402

Cobicistat, Impurities

Cobicisat stage-I enantiomer Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 1370406-80-6

Mol F.

: C23H27N3O2S.HCl

Mol W.

: 446.01

Cat No.

: SA48616

Cobicistat, Impurities

Cobicisat stage-II Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C21H34N4O8S

Mol W.

: 502.58

Cat No.

: SA48610

Cobicistat, Impurities

Cobicistat 2-Amino Amide Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 1051463-15-0

Mol F.

: C31H41N5O4S

Mol W.

: 579.79999999999995

Cat No.

: SA48609

Cobicistat, Impurities

Cobicistat 4-Carbonyl Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C40H51N7O6S2

Mol W.

: 790

Cat No.

: SA48608