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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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Azelastine, Impurities

Azelastine EP Impurity B

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CAS No.

: 117078-69-0

Mol F.

: C14H21N3O : HCl

Mol W.

: 247.3 : 36.5

Cat No.

: SA54704

Azelastine, Impurities

Azelastine EP Impurity C

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CAS No.

: 53242-76-5

Mol F.

: C15H11ClO3

Mol W.

: 274.7

Cat No.

: SA54705

Azelastine, Impurities

Azelastine EP Impurity D

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CAS No.

: 53242-88-9

Mol F.

: C15H11ClN2O

Mol W.

: 270.7

Cat No.

: SA54706

Azelastine, Impurities

Azelastine EP Impurity E

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CAS No.

: 20526-97-0

Mol F.

: C15H9ClO2

Mol W.

: 256.7

Cat No.

: SA54707

Azelastine, Impurities

Azelastine USP Related Compound F

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CAS No.

: 640279-88-5

Mol F.

: C22H24ClN3O2

Mol W.

: 397.9

Cat No.

: SA54708

Aminocaproic Acid

Azepan-2-one

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CAS No.

: 105-60-2

Mol F.

: C6H11NO

Mol W.

: 113.16

Cat No.

: SA22611

Azilsartan, Impurities

Azilsartan 3-nitrobenzoate Impurity

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CAS No.

: 136285-68-2

Mol F.

: C28H27N3O6

Mol W.

: 501.5

Cat No.

: SA42818

Azilsartan, Impurities

Azilsartan Amidoxime Impurity

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CAS No.

: 1449029-77-9

Mol F.

: C29H26N4O7

Mol W.

: 542.54

Cat No.

: SA42813

Azilsartan, Impurities

Azilsartan Dimer Impurity

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CAS No.

: 1604812-35-2

Mol F.

: C35H28N4O11

Mol W.

: 680.62

Cat No.

: SA42814

Azilsartan, Impurities

Azilsartan Medoxomil Potassium

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CAS No.

: 863031-24-7

Mol F.

: C30H23KN4O8

Mol W.

: 606.62

Cat No.

: SA42819

Azilsartan, Impurities

Azilsartan N-hydroxycarbamimidoyl Amino Benzoate Impurity

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CAS No.

: NA

Mol F.

: C22H22N4O3

Mol W.

: 390.5

Cat No.

: SA42817

Azilsartan, Impurities

Azilsartan N-hydroxycarbamimidoyl Methyl Ester Impurity

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CAS No.

: 147403-65-4

Mol F.

: C25H24N4O4

Mol W.

: 444.5

Cat No.

: SA42816

Azilsartan, Impurities

Azilsartan O-Desethyl Carboxylic Acid Impurity

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CAS No.

: 1442400-68-1

Mol F.

: C23H16N4O5

Mol W.

: 428.4

Cat No.

: SA42815

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 EP Impurity Q

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CAS No.

: 2095879-65-3

Mol F.

: C44H75N3O15S

Mol W.

: 918.1

Cat No.

: SA10317

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

Aztreonam, Impurities

Aztreonam

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CAS No.

: 78110-38-0

Mol F.

: C13H17N5O8S2

Mol W.

: 435.4

Cat No.

: SA57700

Aztreonam, Impurities

Aztreonam Desulfated Impurity

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CAS No.

: 102579-59-9

Mol F.

: C13H17N5O5S

Mol W.

: 355.4

Cat No.

: SA57704

Aztreonam, Impurities

Aztreonam E-Isomer

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CAS No.

: 99341-02-3

Mol F.

: C13H17N5O8S2

Mol W.

: 435.4

Cat No.

: SA57701

Aztreonam, Impurities

Aztreonam Ethyl Ester Impurity

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CAS No.

: 102579-57-7

Mol F.

: C15H21N5O8S2

Mol W.

: 463.5

Cat No.

: SA57702

Aztreonam, Impurities

Aztreonam Methyl Ester Impurity

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CAS No.

: 1255912-98-1

Mol F.

: C14H19N5O8S2

Mol W.

: 449.5

Cat No.

: SA57703

Aztreonam, Impurities

Aztreonam Open-Ring Impurity

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CAS No.

: 87500-74-1

Mol F.

: C13H19N5O9S2

Mol W.

: 453.4

Cat No.

: SA57705

Aztreonam, Impurities

Aztreonam Related Compound B

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CAS No.

: 102586-36-7

Mol F.

: C13H19N5O6S

Mol W.

: 373.38

Cat No.

: SA57706

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

Baricitinib, Impurities

Baricitinib

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CAS No.

: 1187594-09-7

Mol F.

: C16H17N7O2S

Mol W.

: 371.4

Cat No.

: SA56400

Baricitinib, Impurities

Baricitinib Acetamide Impurity

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CAS No.

: 2271228-51-2

Mol F.

: C16H19N7O3S

Mol W.

: 389.4

Cat No.

: SA56406

Baricitinib, Impurities

Baricitinib Acid Impurity

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CAS No.

: 2271228-52-3

Mol F.

: C16H18N6O4S

Mol W.

: 390.4

Cat No.

: SA56409

Baricitinib, Impurities

Baricitinib Butylsulfonyl Impurity

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CAS No.

: 1187594-35-9

Mol F.

: C18H21N7O2S

Mol W.

: 399.5

Cat No.

: SA56405

Baricitinib, Impurities

Baricitinib Des-sulfonyl Impurity

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CAS No.

: 1187594-16-6

Mol F.

: C14H13N7

Mol W.

: 279.3

Cat No.

: SA56408

Baricitinib, Impurities

Baricitinib Impurity A

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CAS No.

: 1187595-85-2

Mol F.

: C7H10N2O2S

Mol W.

: 186.2

Cat No.

: SA56401

Baricitinib, Impurities

Baricitinib Impurity B

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CAS No.

: 3680-69-1

Mol F.

: C6H4ClN3

Mol W.

: 153.6

Cat No.

: SA56402

Baricitinib, Impurities

Baricitinib Impurity C

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CAS No.

: 2055723-13-0

Mol F.

: C21H25N7O4S

Mol W.

: 471.5

Cat No.

: SA56403

Baricitinib, Impurities

Baricitinib Methyl Ester Impurity

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CAS No.

: 2402776-80-9

Mol F.

: C17H20N6O4S

Mol W.

: 404.4

Cat No.

: SA56407

Baricitinib, Impurities

Baricitinib Propylsulfonyl Impurity

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CAS No.

: 1187594-34-8

Mol F.

: C17H19N7O2S

Mol W.

: 385.4

Cat No.

: SA56411

Baricitinib, Impurities

Baricitinib Pyrimidinone Impurity

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CAS No.

: 3680-71-5

Mol F.

: C6H5N3O

Mol W.

: 135.1

Cat No.

: SA56404

Beclomethasone Dipropionate, Impurities

Beclomethasone Dipropionate

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CAS No.

: 5534-09-8

Mol F.

: C28H37ClO7

Mol W.

: 521.06

Cat No.

: SA15601

Bedaquiline, Impurities

Bedaquiline

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CAS No.

: 843663-66-1

Mol F.

: C32H31BrN2O2

Mol W.

: 555.5

Cat No.

: SA56900

Bedaquiline, Impurities

Bedaquiline Des-Bromo Impurity

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CAS No.

: 2122862-01-3

Mol F.

: C32H32N2O2

Mol W.

: 476.6

Cat No.

: SA56901