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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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Avatrombopag, Impurities

Avatrombopag Maleate

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CAS No.

: 677007-74-8

Mol F.

: C29H34Cl2N6O3S2 : C4H4O4

Mol W.

: 649.7 116.1

Cat No.

: SA43901

Axitinib, Impurities

Axitinib Asymmetric Dimer Impurity | CAS : 1428728-84-0

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CAS No.

: 1428728-84-0

Mol F.

: C44H36N8O2S2

Mol W.

: 773.0

Cat No.

: SA52216

Axitinib, Impurities

Axitinib Cyclobutane Dimer Impurity | CAS : 1428728-83-9

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CAS No.

: 1428728-83-9

Mol F.

: C44H36N8O2S2

Mol W.

: 773.0

Cat No.

: SA52217

Azacitidine, Impurities

Azacitidine

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CAS No.

: 320-67-2

Mol F.

: C₈H₁₂N₄O₅

Mol W.

: 244.2

Cat No.

: SA37500

Azacitidine, Impurities

Azacitidine Dicarbamide Impurity

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CAS No.

: 108-19-0

Mol F.

: C2H5N3O2

Mol W.

: 103.08

Cat No.

: SA37508

Azacitidine, Impurities

Azacitidine Formyl Amidine Analog

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CAS No.

: 65126-88-7

Mol F.

: C8H14N4O6

Mol W.

: 262.22

Cat No.

: SA37504

Azacitidine, Impurities

Azacitidine Related Compound C Isomer-4

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CAS No.

: 1698011-17-4

Mol F.

: C7H14N4O5

Mol W.

: 234.2

Cat No.

: SA37510

Azathioprine, Impurities

Azathioprine

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CAS No.

: 446-86-6

Mol F.

: C9H7N7O2S

Mol W.

: 277.26

Cat No.

: SA17900

Azathioprine, Impurities

Azathioprine EP Impurity C

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CAS No.

: 4897-25-0

Mol F.

: C4H4ClN3O2

Mol W.

: 161.55

Cat No.

: SA17904

Azathioprine, Impurities

Azathioprine EP Impurity D

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CAS No.

: 6339-54-4

Mol F.

: C₄H₅N₃O₂S

Mol W.

: 159.17

Cat No.

: SA17905

Azathioprine, Impurities

Azathioprine EP Impurity E

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CAS No.

: 73703-74-9 (free base); 35681-68-6(sodium salt)

Mol F.

: C4H4N3NaO3

Mol W.

: 165.08

Cat No.

: SA17906

Azathioprine, Impurities

Azathioprine EP Impurity F

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CAS No.

: 68-94-0

Mol F.

: C5H4N4O

Mol W.

: 136.11

Cat No.

: SA17907

Azathioprine, Impurities

Azathioprine Purinylthio Purine Impurity

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CAS No.

: NA

Mol F.

: C10H6N8S

Mol W.

: 270.27

Cat No.

: SA17909

Aminocaproic Acid

Azepan-2-one

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CAS No.

: 105-60-2

Mol F.

: C6H11NO

Mol W.

: 113.16

Cat No.

: SA22611

Azithromycin, Impurities

Azithromycin

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CAS No.

: 117772-70-0

Mol F.

: C38H76N2O14

Mol W.

: 785.02

Cat No.

: SA10300

Azithromycin, Impurities

Azithromycin EP Impurity A

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CAS No.

: 76801-85-9

Mol F.

: C37H70N2O12

Mol W.

: 734.96

Cat No.

: SA10309

Azithromycin, Impurities

Azithromycin EP Impurity B

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CAS No.

: 307974-61-4

Mol F.

: C38H72N2O11

Mol W.

: 732.99

Cat No.

: SA10310

Azithromycin, Impurities

Azithromycin EP Impurity C

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CAS No.

: 620169-47-3

Mol F.

: C37H70N2O12

Mol W.

: 734.96

Cat No.

: SA10311

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

Building Blocks, Impurities

Benzohydrazide

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CAS No.

: 613-94-5

Mol F.

: C7H8N2O

Mol W.

: 136.15

Cat No.

: SB10721

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

Benzylhydrochlorothiazide

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CAS No.

: 1824-50-6

Mol F.

: C₁₄H₁₄ClN₃O₄S₂

Mol W.

: 387.86

Cat No.

: SA11205

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