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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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Azithromycin, Impurities

Azithromycin EP Impurity D

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CAS No.

: 612069-26-8

Mol F.

: C38H72N2O13

Mol W.

: 764.98

Cat No.

: SA10312

Azithromycin, Impurities

Azithromycin EP Impurity K

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CAS No.

: 612534-95-9

Mol F.

: C38H70N2O13

Mol W.

: 762.97

Cat No.

: SA10315

Azithromycin, Impurities

Azithromycin EP Impurity O

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CAS No.

: 763924-54-5

Mol F.

: C39H74N2O12

Mol W.

: 763.01

Cat No.

: SA10308

Azithromycin, Impurities

Azithromycin Impurity E

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CAS No.

: 612069-27-9

Mol F.

: C36H68N2O12

Mol W.

: 720.93

Cat No.

: SA10301

Azithromycin, Impurities

Azithromycin Impurity F

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CAS No.

: 612069-28-0

Mol F.

: C38H70N2O13

Mol W.

: 762.97

Cat No.

: SA10302

Azithromycin, Impurities

Azithromycin Impurity L

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CAS No.

: 90503-06-3

Mol F.

: C38H72N2O13

Mol W.

: 764.98

Cat No.

: SA10305

Azithromycin, Impurities

Azithromycin Impurity M

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CAS No.

: 765927-71-7

Mol F.

: C37H68N2O13

Mol W.

: 748.94

Cat No.

: SA10306

Azithromycin, Impurities

Azithromycin Impurity N

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CAS No.

: 612069-25-7

Mol F.

: C36H65NO13

Mol W.

: 719.9

Cat No.

: SA10307

Baclofen, Impurities

Baclofen Butylester

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CAS No.

: 114661-63-1; 947583-11-1 (HCl salt)

Mol F.

: C14H20ClNO2

Mol W.

: 269.77

Cat No.

: SA28108

Baclofen, Impurities

Baclofen EP Impurity A

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CAS No.

: 22518-27-0

Mol F.

: C10H10ClNO

Mol W.

: 195.64

Cat No.

: SA28100

Baclofen, Impurities

Baclofen EP Impurity B

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CAS No.

: 1141-23-7

Mol F.

: C11H12ClNO3

Mol W.

: 241.67

Cat No.

: SA28101

Beclomethasone Dipropionate, Impurities

Beclomethasone Dipropionate

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CAS No.

: 5534-09-8

Mol F.

: C28H37ClO7

Mol W.

: 521.06

Cat No.

: SA15601

Benazepril, Impurities

Benazepril EP Impurity D

$695.00 25 mg

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CAS No.

: 112110-48-2

Mol F.

: C24H34N2O5

Mol W.

: 430.54

Cat No.

: SA29604

Impurities, Nitrosamine

Benidipine Nitroso Impurity

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CAS No.

: NA

Mol F.

: C28H30N4O7

Mol W.

: 534.6

Cat No.

: SA44668

Aspirin, Impurities

Benorilate

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CAS No.

: 5003-48-5

Mol F.

: C17H15NO5

Mol W.

: 313.3

Cat No.

: SA28508

Impurities, Varenicline

Benzimidazole Varenicline

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CAS No.

: 357424-12-5

Mol F.

: C12H13N3

Mol W.

: 199.25

Cat No.

: SA39513

Brexpiprazole, Impurities

Benzo[b]thiophene

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CAS No.

: 95-15-8

Mol F.

: C8H6S

Mol W.

: 134.2

Cat No.

: SA41321

Aspirin, Impurities

Benzoic acid

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CAS No.

: 65-85-0

Mol F.

: C7H6O2

Mol W.

: 122.12

Cat No.

: SA28515

Gemcitabine, Impurities

Benzoic acid-(ethoxycarbonyl-difluoro-methyl)-2,3-dihydroxy-propyl ester

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CAS No.

: 122111-10-8

Mol F.

: C14H16F2O6

Mol W.

: 318.3

Cat No.

: SA44505

Atropine, Impurities

Benzoyltropein

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CAS No.

: 16052-34-9

Mol F.

: C15H19NO2

Mol W.

: 245.32

Cat No.

: SA47711

Impurities, Pregabalin

Benzyl 3-((3-(Aminomethyl)-5-methylhexanamido)methyl)-5-methylhexanoate

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CAS No.

: NA

Mol F.

: C23H2N2O3

Mol W.

: 390.56

Cat No.

: SA24825

Dapagliflozin

Benzyl Dimer Dapgliflozin Impurity

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CAS No.

: 2183515-30-0

Mol F.

: C28H30Cl2O6

Mol W.

: 533.44

Cat No.

: SA15057

Donepezil, Impurities

Benzyl Donepezil Bromide

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CAS No.

: 844694-85-5

Mol F.

: C31H36BrNO3

Mol W.

: 550.53

Cat No.

: SA34310

Ezetimibe, Impurities

Benzyl Ezetimibe Diol

$495.00 25 mg

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CAS No.

: 1374250-06-2

Mol F.

: C31H31F2NO3

Mol W.

: 503.59

Cat No.

: SA14816

Hydrochlorothiazide, Impurities

Benzylhydrochlorothiazide

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CAS No.

: 1824-50-6

Mol F.

: C₁₄H₁₄ClN₃O₄S₂

Mol W.

: 387.86

Cat No.

: SA11205

Neomycin

Benzylidene Ribosylparomamine Derivative

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In Stock

CAS No.

Mol F.

: C24H37N3O11

Mol W.

: 543.56

Cat No.

: SA51409

Betamethasone, Impurities

Betamethasone

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CAS No.

: 378-44-9

Mol F.

: C22H29FO5

Mol W.

: 392.46

Cat No.

: SA26600

Betamethasone Dipropionate, Impurities

Betamethasone Dipropionate

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CAS No.

: 5593-20-4

Mol F.

: C28H37FO7

Mol W.

: 504.59

Cat No.

: SA14512

Betamethasone, Impurities

Betamethasone EP Impurity A

$95.00 25 mg

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CAS No.

: 50-02-2

Mol F.

: C22H29FO5

Mol W.

: 392.46

Cat No.

: SA26601

Betamethasone, Impurities

Betamethasone EP Impurity F

$1,595.00 25 mg

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CAS No.

: 330157-04-5

Mol F.

: C22H28O4

Mol W.

: 356.46

Cat No.

: SA26606

Betamethasone, Impurities

Betamethasone EP Impurity H

$1,595.00 25 mg

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CAS No.

: 185613-71-2

Mol F.

: C22H29FO5

Mol W.

: 392.46

Cat No.

: SA26608

Betamethasone, Impurities

Betamethasone EP Impurity I

$1,695.00 25 mg

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CAS No.

: 185613-69-8

Mol F.

: C22H29FO5

Mol W.

: 392.46

Cat No.

: SA26609

Betamethasone, Impurities

Betamethasone EP Impurity J

$1,695.00 25 mg

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CAS No.

: 18383-24-9

Mol F.

: C22H30O4

Mol W.

: 358.47

Cat No.

: SA26610

Betamethasone Valerate, Impurities

Betamethasone Valerate

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CAS No.

: 2152-44-5

Mol F.

: C27H37FO6

Mol W.

: 476.58

Cat No.

: SA18508

Betamethasone Valerate, Impurities

Betamethasone Valerate EP Impurity G

$455.00 25 mg

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CAS No.

Mol F.

: C27H36BrFO6

Mol W.

: 555.47

Cat No.

: SA18503

Betamethasone, Impurities

Betamethasone-21-Acetal

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CAS No.

: 1184871-60-0

Mol F.

: C44H56F2O11

Mol W.

: 798.91

Cat No.

: SA26615

Bicalutamide, Impurities

Bicalutamide

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CAS No.

: 90357-06-5

Mol F.

: C18H14F4N2O4S

Mol W.

: 430.38

Cat No.

: SA35300

Bicalutamide, Impurities

Bicalutamide EP Impurity A

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CAS No.

: 90357-05-4

Mol F.

: C18H15F3N2O4S

Mol W.

: 412.38

Cat No.

: SA35301

Bicalutamide, Impurities

Bicalutamide EP Impurity B

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CAS No.

: 1159977-36-2

Mol F.

: C18H14F4N2O4S

Mol W.

: 430.38

Cat No.

: SA35302

Bicalutamide, Impurities

Bicalutamide EP Impurity C

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CAS No.

: 906008-94-4

Mol F.

: C18H14F4N2O3S

Mol W.

: 414.38

Cat No.

: SA35303

Bicalutamide, Impurities

Bicalutamide EP Impurity D

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CAS No.

: 654-70-6

Mol F.

: C8H5F3N2

Mol W.

: 186.13

Cat No.

: SA35304

Bicalutamide, Impurities

Bicalutamide EP Impurity E

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CAS No.

: NA

Mol F.

: C18H14F4N2O3S

Mol W.

: 414.38

Cat No.

: SA35305

Bicalutamide, Impurities

Bicalutamide EP Impurity F

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CAS No.

: NA

Mol F.

: C18H14F4N2O3S

Mol W.

: 414.38

Cat No.

: SA35306

Bicalutamide, Impurities

Bicalutamide EP Impurity H

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CAS No.

: NA

Mol F.

: C18H14F4N2O4S

Mol W.

: 430.38

Cat No.

: SA35307

Bicalutamide, Impurities

Bicalutamide EP Impurity I

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CAS No.

: NA

Mol F.

: C17H14BrF4NO3S

Mol W.

: 468.26

Cat No.

: SA35308

Bicalutamide, Impurities

Bicalutamide EP Impurity J

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CAS No.

: 90356-78-8

Mol F.

: C18H14F4N2O2S

Mol W.

: 398.38

Cat No.

: SA35309

Bicalutamide, Impurities

Bicalutamide EP Impurity K

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CAS No.

: NA

Mol F.

: C24H20F6N4O6S

Mol W.

: 606.5

Cat No.

: SA35310

Bicalutamide, Impurities

Bicalutamide EP Impurity M

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CAS No.

: 151262-57-6

Mol F.

: C10H11FO5S

Mol W.

: 262.26

Cat No.

: SA35311

Bicalutamide, Impurities

Bicalutamide Glucoronide Impurity

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CAS No.

: NA

Mol F.

: C25H22F6N2O10S

Mol W.

: 656.51

Cat No.

: SA35315

Bicalutamide, Impurities

Bicalutamide Oxirane Impurity

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CAS No.

: 90357-51-0

Mol F.

: C12H9F3N2O2

Mol W.

: 270.21

Cat No.

: SA35314