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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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Bosentan, Impurities

Bosentan Dimer

Please enquire for price & pack size

In Stock

CAS No.

: 1097263-60-9

Mol F.

: C52H52N10O10S2

Mol W.

: 1041.16

Cat No.

: SA28609

Brexpiprazole, Impurities

Brexpiprazole (3,4)-Dihydro-2(1H)-quinolinone

Please enquire for price & pack size

In Stock

CAS No.

: 913612-07-4

Mol F.

: C25H29N3O2S

Mol W.

: 435.58

Cat No.

: SA41323

Brexpiprazole, Impurities

Brexpiprazole N-Oxide

Please enquire for price & pack size

In Stock

CAS No.

: 1191900-58-9

Mol F.

: C25H27N3O3S

Mol W.

: 449.57

Cat No.

: SA41304

Brexpiprazole, Impurities

Brexpiprazole N,N-dioxide Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 2247155-42-4

Mol F.

: C25H27N3O4S

Mol W.

: 465.56

Cat No.

: SA41329

Brexpiprazole, Impurities

Brexpiprazole regioisomer Impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C25H28N3O2S

Mol W.

: 434.58

Cat No.

: SA41330

Brimonidine, Impurities

Brimonidine

$100.00 25 mg

In Stock

CAS No.

: 59803-98-4

Mol F.

: C11H10BrN5

Mol W.

: 292.13

Cat No.

: SA20712

Brimonidine, Impurities

Brimonidine 2,3-Dione Impurity

$350.00 25 mg

In Stock

CAS No.

: 182627-95-8

Mol F.

: C11H10BrN5O2

Mol W.

: 324.13

Cat No.

: SA20701

Brimonidine, Impurities

Brimonidine EP Impurity A

$150.00 25 mg

In Stock

CAS No.

: 91147-43-2

Mol F.

: C11H11N5

Mol W.

: 213.24

Cat No.

: SA20708

Brimonidine, Impurities

Brimonidine EP Impurity B

$80.00 25 mg

In Stock

CAS No.

: 50358-63-9

Mol F.

: C8H6BrN3

Mol W.

: 224.06

Cat No.

: SA20709

Brimonidine, Impurities

Brimonidine EP Impurity C

$80.00 25 mg

In Stock

CAS No.

: 6298-37-9

Mol F.

: C8H7N3

Mol W.

: 145.16

Cat No.

: SA20710

Brimonidine, Impurities

Brimonidine EP Impurity D

$100.00 25 mg

In Stock

CAS No.

: 842138-74-3

Mol F.

: C9H7BrN4S

Mol W.

: 283.15

Cat No.

: SA20704

Brimonidine, Impurities

Brimonidine EP Impurity E

$350.00 25 mg

In Stock

CAS No.

: 1797986-78-7 (HCl Salt); 168329-48-4(base)

Mol F.

: C9H8BrN5

Mol W.

: 266.1

Cat No.

: SA20705

Brimonidine

Brimonidine EP Impurity F

$150.00 10 mg

In Stock

CAS No.

: 151110-15-5

Mol F.

: C11H8BrN5

Mol W.

: 290.12

Cat No.

: SA20711

Brimonidine, Impurities

Brimonidine EP Impurity G

$250.00 25 mg

In Stock

CAS No.

: 1216379-05-3 (FreeBase); 1391054-10-6 (TFA Salt)

Mol F.

: C11H12BrH5O

Mol W.

: 310.15

Cat No.

: SA20706

Brimonidine, Impurities

Brimonidine EP Impurity H

$450.00 25 mg

In Stock

CAS No.

: 91147-46-5

Mol F.

: C11H10ClN5

Mol W.

: 247.68

Cat No.

: SA20707

Brimonidine

Brimonidine Imidazolyl Quinoxaline Amine Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 185312-10-1

Mol F.

: C11H9N5

Mol W.

: 211.23

Cat No.

: SA20726

Brimonidine, Impurities

Brimonidine Propionic Acid Impurity

$500.00 25 mg

In Stock

CAS No.

Mol F.

: C14H14BrN5O2

Mol W.

: 364.2

Cat No.

: SA20725

Brivaracetam, Impurities

Brivaracetam

$100.00 25 mg

In Stock

CAS No.

: 357336-20-0

Mol F.

: C11H20N2O2

Mol W.

: 212.3

Cat No.

: SA47300

Brivaracetam, Impurities

Brivaracetam Impurity D

$195.00 25 mg

In Stock

CAS No.

: 943986-67-2

Mol F.

: C11H19NO3

Mol W.

: 213.14

Cat No.

: SA47309

Brivaracetam, Impurities

Brivaracetam Impurity E

Please enquire for price & pack size

In Stock

CAS No.

: 2165431-90-1

Mol F.

: C11H19NO3

Mol W.

: 213.28

Cat No.

: SA47313

Brivaracetam, Impurities

Brivaracetam R lacton impurity

Please enquire for price & pack size

In Stock

CAS No.

: 63095-51-2

Mol F.

: C7H12O2

Mol W.

: 128.17

Cat No.

: SA47312

Brivaracetam, Impurities

Brivaracetam racemic lacton impurity

Please enquire for price & pack size

In Stock

CAS No.

: 72397-60-5

Mol F.

: C7H12O2

Mol W.

: 128.17

Cat No.

: SA47311

Brivaracetam, Impurities

Brivaracetam S lacton impurity

Please enquire for price & pack size

In Stock

CAS No.

: 63095-60-3

Mol F.

: C7H12O2

Mol W.

: 128.17

Cat No.

: SA47310

Bromfenac, Impurities

Bromfenac

Please enquire for price & pack size

In Stock

CAS No.

: 241496-82-2

Mol F.

: C14H10BrNO3

Mol W.

: 320.14

Cat No.

: SA18910

Bromfenac, Impurities

Bromfenac Sodium Imp -B

$250.00 25 mg

In Stock

CAS No.

: 91713-90-5

Mol F.

: C16H12BrNO2S

Mol W.

: 362.24

Cat No.

: SA18902

Bromfenac, Impurities

Bromfenac Sodium Imp -C

Please enquire for price & pack size

In Stock

CAS No.

: 91713-91-6

Mol F.

: C15H10BrNO2

Mol W.

: 316.15

Cat No.

: SA18903

Bromhexine, Impurities

Bromhexine EP Impurity A

Please enquire for price & pack size

In Stock

CAS No.

: 50739-76-9

Mol F.

: C7H7Br2NO

Mol W.

: 280.94

Cat No.

: SA28401

Febuxostat, Impurities

Bromo febuxostat impurity

Please enquire for price & pack size

In Stock

CAS No.

: 144060-40-2

Mol F.

: C₁₅H₁₆BrNO₃S

Mol W.

: 370.26

Cat No.

: SA32009

Fluorometholone, Impurities

Bromomedradient

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C23H29BrO5

Mol W.

: 465.377

Cat No.

: SA38415

Colesevelam, Impurities

Bromoquat

$70.00 25 mg

In Stock

CAS No.

: 32765-81-4

Mol F.

: C9H21Br2N

Mol W.

: 303.08

Cat No.

: SA10201

Chlorpromazine, Impurities

Brompromazine

$395.00 25 mg

In Stock

CAS No.

: 15502-93-9

Mol F.

: C17H19BrN2S

Mol W.

: 363.32

Cat No.

: SA21614

Budesonide, Impurities

Budesonide (22R)-Isomer

$995.00 25 mg

In Stock

CAS No.

: 51372-29-3

Mol F.

: C25H34O6

Mol W.

: 430.53

Cat No.

: SA14115

Budesonide, Impurities

Budesonide 1,4,14-Triene Triol Impurity

$695.00 25 mg

In Stock

CAS No.

: 131918-72-4

Mol F.

: C23H28O7

Mol W.

: 416.46

Cat No.

: SA14125

Budesonide, Impurities

Budesonide 1,4,16-Triene Impurity

$95.00 25 mg

In Stock

CAS No.

: 3044-42-6

Mol F.

: C23H28O5

Mol W.

: 384.47

Cat No.

: SA14126

Budesonide, Impurities

Budesonide 17-Carboxylic Acid Impurity

$155.00 25 mg

In Stock

CAS No.

: 192057-49-1

Mol F.

: C24H32O6

Mol W.

: 416.51

Cat No.

: SA14120

Budesonide, Impurities

Budesonide 21-Butyrate Impurity

$175.00 25 mg

In Stock

CAS No.

: 2408495-96-3

Mol F.

: C29H40O7

Mol W.

: 500.62

Cat No.

: SA14111

Budesonide, Impurities

Budesonide EP Impurity A

$95.00 25 mg

In Stock

CAS No.

: 13951-70-7

Mol F.

: C21H28O6

Mol W.

: 376.44

Cat No.

: SA14103

Budesonide, Impurities

Budesonide EP Impurity B

$155.00 25 mg

In Stock

CAS No.

: 1040085-98-0

Mol F.

: C23H30O6

Mol W.

: 402.48

Cat No.

: SA14112

Budesonide, Impurities

Budesonide EP Impurity C

$500.00 25 mg

In Stock

CAS No.

: 1040085-99-1

Mol F.

: C25H34O6

Mol W.

: 430.43

Cat No.

: SA14131

Budesonide, Impurities

Budesonide EP Impurity D

$195.00 25 mg

In Stock

CAS No.

: 85234-63-5

Mol F.

: C25H32O6

Mol W.

: 428.52

Cat No.

: SA14104

Budesonide, Impurities

Budesonide EP Impurity E

$355.00 25 mg

In Stock

CAS No.

: 131918-64-4

Mol F.

: C25H32O6

Mol W.

: 428.52

Cat No.

: SA14118

Budesonide, Impurities

Budesonide EP Impurity F

$95.00 25 mg

In Stock

CAS No.

: 638-94-8

Mol F.

: C24H32O6

Mol W.

: 416.51

Cat No.

: SA14106

Budesonide, Impurities

Budesonide EP Impurity G

$225.00 25 mg

In Stock

CAS No.

: 137174-25-5

Mol F.

: C25H36O6

Mol W.

: 432.55

Cat No.

: SA14108

Budesonide, Impurities

Budesonide EP Impurity H

$255.00 25 mg

In Stock

CAS No.

: 313474-58-7

Mol F.

: C25H32O5

Mol W.

: 412.52

Cat No.

: SA14110

Budesonide, Impurities

Budesonide EP Impurity I

$255.00 25 mg

In Stock

CAS No.

: 113930-13-5

Mol F.

: C25H34O7

Mol W.

: 446.53

Cat No.

: SA14109

Budesonide, Impurities

Budesonide EP Impurity J

$295.00 25 mg

In Stock

CAS No.

: 313474-59-8

Mol F.

: C25H33BrO6

Mol W.

: 509.43

Cat No.

: SA14123

Budesonide, Impurities

Budesonide EP Impurity K

$155.00 25 mg

In Stock

CAS No.

: 51333-05-2

Mol F.

: C27H36O7

Mol W.

: 472.57

Cat No.

: SA14102

Budesonide, Impurities

Budesonide EP Impurity L

$175.00 25 mg

In Stock

CAS No.

: 216453-74-6

Mol F.

: C25H32O6

Mol W.

: 428.52

Cat No.

: SA14101

Bumetanide, Impurities

Bumetanide EP Impurity A

$100.00 25 mg

In Stock

CAS No.

: 28328-53-2

Mol F.

: C13H10N2O7S

Mol W.

: 338.29

Cat No.

: SA24400

Bumetanide, Impurities

Bumetanide EP Impurity B

$150.00 25 mg

In Stock

CAS No.

: 28328-54-3

Mol F.

: C13H12N2O5S

Mol W.

: 308.31

Cat No.

: SA24401