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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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Brivaracetam, Impurities

Brivaracetam-N-butyramide

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CAS No.

: 357336-20-0

Mol F.

: C15H27N3O3

Mol W.

: 297.39

Cat No.

: SA47306

Diphenhydramine, Impurities

Bromazine

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CAS No.

: 1808-12-4(HCl); 118-23-0(Base)

Mol F.

: C17H21BrClNO

Mol W.

: 370.71

Cat No.

: SA19803

Bromfenac, Impurities

Bromfenac Dimer

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CAS No.

: NA

Mol F.

: C30H18Br2N2O4

Mol W.

: 630.28

Cat No.

: SA18908

Bromfenac, Impurities

Bromfenac Ethyl Ester

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CAS No.

: 102414-22-2

Mol F.

: C17H16BrNO3

Mol W.

: 362.22

Cat No.

: SA18905

Bromfenac, Impurities

Bromfenac Methyl Ester

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CAS No.

: NA

Mol F.

: C16H14BrNO3

Mol W.

: 348.19

Cat No.

: SA18906

Bromfenac, Impurities

Bromfenac sodium salt

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CAS No.

: 120638-55-3

Mol F.

: C15H11BrNNaO3

Mol W.

: 356.15

Cat No.

: SA18904

Bromhexine, Impurities

Bromhexine

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CAS No.

: 611-75-6

Mol F.

: C14H20Br2N2

Mol W.

: 376.13

Cat No.

: SA28400

Bromhexine, Impurities

Bromhexine Acid

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CAS No.

: 609-85-8

Mol F.

: C7H5Br2NO2

Mol W.

: 609-85-8

Cat No.

: SA28409

Bromhexine, Impurities

Bromhexine EP Impurity B

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CAS No.

: 50910-55-9

Mol F.

: C7H5Br2NO

Mol W.

: 278.93

Cat No.

: SA28402

Bromhexine, Impurities

Bromhexine EP Impurity C

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CAS No.

: 57365-08-9

Mol F.

: C14H22N2

Mol W.

: 218.34

Cat No.

: SA28403

Bromhexine, Impurities

Bromhexine EP Impurity E

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CAS No.

: 1661064-00-1(Base);1660957-93-6(Chloride)

Mol F.

: C15H21Br2N2

Mol W.

: 389.15

Cat No.

: SA28405

Bromhexine, Impurities

Bromhexine N-Oxide

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CAS No.

: NA

Mol F.

: C14H20Br2N2O

Mol W.

: 392.13

Cat No.

: SA28406

Apixaban, Impurities

Bromo Nitro Ethyl Ester Apixaban Impurity

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CAS No.

: NA

Mol F.

: C22H17BrN4O6

Mol W.

: 513.3

Cat No.

: SA39914

Budesonide, Impurities

Budesonide 17-Keto 11-β-16-α-diol Impurity

$395.00 25 mg

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CAS No.

: 910299-74-0

Mol F.

: C19H24O4

Mol W.

: 316.39

Cat No.

: SA14113

Budesonide, Impurities

Budesonide 17,21-Diacetyloxy Impurity

$155.00 25 mg

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CAS No.

: 17652-24-3

Mol F.

: C25H32O7

Mol W.

: 444.52

Cat No.

: SA14127

Budesonide, Impurities

Budesonide 21-carboxylic acid Impurity

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CAS No.

Mol F.

: C25H32O7

Mol W.

: 444.53

Cat No.

: SA14122

Budesonide, Impurities

Budesonide 21-Sulfate

$175.00 25 mg

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CAS No.

: 1436796-04-1

Mol F.

: C25H34O9S

Mol W.

: 510.6

Cat No.

: SA14107

Budesonide, Impurities

Budesonide 6-α-Hydroxy Impurity

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CAS No.

: 577777-51-6

Mol F.

: C25H34O7

Mol W.

: 446.53

Cat No.

: SA14116

Budesonide, Impurities

Budesonide 6-β-Hydroxy Impurity

$495.00 25 mg

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CAS No.

: 88411-77-2

Mol F.

: C25H34O7

Mol W.

: 446.53

Cat No.

: SA14117

Bumetanide, Impurities

Bumetanide

$100.00 25 mg

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CAS No.

: 28395-03-1

Mol F.

: C17H20N2O5S

Mol W.

: 364.42

Cat No.

: SA24404

Bupropion, Impurities

Bupropion Hydrochloride

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CAS No.

: 31677-93-7

Mol F.

: C₁₃H₁₉Cl₂NO

Mol W.

: 276.2

Cat No.

: SA12221

Bupropion, Impurities

Bupropion hydrochloride API

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CAS No.

: 34841-39-9

Mol F.

: C13H18ClNO

Mol W.

: 239.74

Cat No.

: SA12236

Bupropion, Impurities

Bupropion Hydroxy Impurity

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CAS No.

: 92264-81-8

Mol F.

: C13H18ClNO2

Mol W.

: 255.74

Cat No.

: SA12237

Buspirone, Impurities

Buspirone 5-Hydroxy Metabolite

$1,550.00 25 mg

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CAS No.

: 105496-33-1

Mol F.

: C21H31N5O3

Mol W.

: 401.5

Cat No.

: SA25814

Buspirone, Impurities

Buspirone 6-Hydroxy Metabolite

$1,550.00 25 mg

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CAS No.

: 125481-61-0

Mol F.

: C21H31N5O3

Mol W.

: 401.5

Cat No.

: SA25815

Buspirone, Impurities

Buspirone EP Impurity B

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CAS No.

: 81461-73-6

Mol F.

: C12H19BrN4

Mol W.

: 299.21

Cat No.

: SA25801

Buspirone, Impurities

Buspirone EP Impurity F

$295.00 25 mg

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CAS No.

: 2512210-24-9

Mol F.

: C33H51N9O3

Mol W.

: 621.82

Cat No.

: SA25805

Buspirone, Impurities

Buspirone EP Impurity I

$350.00 25 mg

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CAS No.

: 2725354-99-2

Mol F.

: C21H30ClN5O2

Mol W.

: 419.95

Cat No.

: SA25808

Impurities, Sitagliptin

butyl 4-hydroxy-3,5-bis(3-(trifluoromethyl)-5,6-dihydro-[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl)benzoate

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CAS No.

Mol F.

: C23H24F6N8O3

Mol W.

: 574.48

Cat No.

: SA10458

Cabozantinib, Impurities

Cabozantinib (S) Malate | CAS : 1140909-48-3

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CAS No.

: 1140909-48-3

Mol F.

: C32H30FN3O10

Mol W.

: 635.59

Cat No.

: SA52517

Cabozantinib, Impurities

Cabozantinib 2-Fluoro Impurity

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CAS No.

: NA

Mol F.

: C28H24FN3O5

Mol W.

: 501.5

Cat No.

: SA52501

Cabozantinib, Impurities

Cabozantinib 2-fluorophenyl amide Impurity

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CAS No.

: 918642-61-2

Mol F.

: C11H10FNO3

Mol W.

: 223.2

Cat No.

: SA52522

Cabozantinib, Impurities

Cabozantinib 3-Fluoro Impurity

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CAS No.

: NA

Mol F.

: C28H24FN3O5

Mol W.

: 501.5

Cat No.

: SA52502

Cabozantinib, Impurities

Cabozantinib 3-fluorophenyl amide Impurity | CAS : 1247859-37-5

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CAS No.

: 1247859-37-5

Mol F.

: C11H10FNO3

Mol W.

: 223.2

Cat No.

: SA52523

Cabozantinib, Impurities

Cabozantinib 4-Chlorophenyl Analog

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CAS No.

: NA

Mol F.

: C28H24ClN3O5

Mol W.

: 518.0

Cat No.

: SA52515

Cabozantinib, Impurities

Cabozantinib 4-fluorophenyl amide Impurity | CAS : 1345847-71-3

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CAS No.

: 1345847-71-3

Mol F.

: C12H12FNO3

Mol W.

: 237.2

Cat No.

: SA52520

Cabozantinib, Impurities

Cabozantinib 4-fluorophenyl oxalamide Dimer Impurity

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CAS No.

: 10197-51-0

Mol F.

: C14H10F2N2O2

Mol W.

: 276.2

Cat No.

: SA52521

Cabozantinib, Impurities

Cabozantinib 4-nitrophenoxy Impurity | CAS : 190728-24-6

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CAS No.

: 190728-24-6

Mol F.

: C17H14N2O5

Mol W.

: 326.3

Cat No.

: SA52510

Cabozantinib, Impurities

Cabozantinib 6-hydroxy Impurity | CAS : 1628530-47-1

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CAS No.

: 1628530-47-1

Mol F.

: C27H22FN3O5

Mol W.

: 487.5

Cat No.

: SA52506

Cabozantinib, Impurities

Cabozantinib 7-hydroxy Impurity | CAS : 1628530-42-6

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CAS No.

: 1628530-42-6

Mol F.

: C27H22FN3O5

Mol W.

: 487.5

Cat No.

: SA52505

Cabozantinib, Impurities

Cabozantinib API | CAS : 849217-68-1

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CAS No.

: 849217-68-1

Mol F.

: C28H24FN3O5

Mol W.

: 501.5

Cat No.

: SA52500

Cabozantinib, Impurities

Cabozantinib Bis(4-fluorophenyl) dicarboxamide Impurity

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CAS No.

: 1431468-36-8

Mol F.

: C17H14F2N2O2

Mol W.

: 316.3

Cat No.

: SA52511

Cabozantinib, Impurities

Cabozantinib Carboxylic Acid Impurity | CAS : 849217-77-2

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CAS No.

: 849217-77-2

Mol F.

: C22H20N2O6

Mol W.

: 408.4

Cat No.

: SA52504

Cabozantinib, Impurities

Cabozantinib Chloro Impurity | CAS : 35654-56-9

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CAS No.

: 35654-56-9

Mol F.

: C11H10ClNO2

Mol W.

: 223.7

Cat No.

: SA52524

Cabozantinib, Impurities

Cabozantinib cyclopropyl dicarboxamide Dimer

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CAS No.

: 2439164-91-5

Mol F.

: C39H34N4O8

Mol W.

: 686.7

Cat No.

: SA52516

Cabozantinib, Impurities

Cabozantinib Des Fluoro Impurity | CAS : 849221-94-9

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CAS No.

: 849221-94-9

Mol F.

: C28H25N3O5

Mol W.

: 483.5

Cat No.

: SA52503

Cabozantinib, Impurities

Cabozantinib Fumarate

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CAS No.

: NA

Mol F.

: C32H28FN3O9

Mol W.

: 617.59

Cat No.

: SA52508

Cabozantinib, Impurities

Cabozantinib Hydroxyphenyl Impurity | CAS : 849217-60-3

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CAS No.

: 849217-60-3

Mol F.

: C17H15FN2O3

Mol W.

: 314.3

Cat No.

: SA52509

Cabozantinib, Impurities

Cabozantinib Methyl Ester Analog | CAS : 1584696-82-1

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CAS No.

: 1584696-82-1

Mol F.

: C23H22N2O6

Mol W.

: 422.4

Cat No.

: SA52512

Cabozantinib, Impurities

Cabozantinib N-oxide Impurity | CAS : 1621681-63-7

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CAS No.

: 1621681-63-7

Mol F.

: C28H24FN3O6

Mol W.

: 517.5

Cat No.

: SA52513