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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 hydroxyethoxy ethyl Impurity

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CAS No.

: 1257099-43-6

Mol F.

: C29H33N5O7S

Mol W.

: 595.67

Cat No.

: SA28608

Brexpiprazole, Impurities

Brexpiprazole

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CAS No.

: 913611-97-9

Mol F.

: C25H27N3O2S

Mol W.

: 433.57

Cat No.

: SA41300

Brexpiprazole, Impurities

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

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CAS No.

: 913612-07-4

Mol F.

: C25H29N3O2S

Mol W.

: 435.58

Cat No.

: SA41317

Brexpiprazole, Impurities

Brexpiprazole 4-Chlorobenzo thiophene Impurity | CAS : 66490-33-3

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CAS No.

: 66490-33-3

Mol F.

: C8H5ClS

Mol W.

: 168.6

Cat No.

: SA41341

Brexpiprazole, Impurities

Brexpiprazole Benzo[b]thiophene Dimer

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CAS No.

: 1420987-86-5

Mol F.

: C20H18N2S2

Mol W.

: 350.5

Cat No.

: SA41322

Brexpiprazole, Impurities

Brexpiprazole Desquinolinonyl Impurity

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CAS No.

: 913614-15-0

Mol F.

: C16H22N2OS

Mol W.

: 290.42

Cat No.

: SA41303

Brexpiprazole, Impurities

Brexpiprazole DiBenzo[b]thiophene Analog

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CAS No.

: NA

Mol F.

: C33H33N3O2S2

Mol W.

: 567.77

Cat No.

: SA41305

Brexpiprazole, Impurities

Brexpiprazole DiOxide

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CAS No.

: NA

Mol F.

: C25H27N3O4S

Mol W.

: 465.57

Cat No.

: SA41308

Brexpiprazole, Impurities

Brexpiprazole N-Dimer Impurity

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CAS No.

: 2094559-58-5

Mol F.

: C38H40N4O4S

Mol W.

: 648.81

Cat No.

: SA41307

Brexpiprazole, Impurities

Brexpiprazole O-Dimer

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CAS No.

: 2116542-21-1

Mol F.

: C38H40N4O4S

Mol W.

: 648.81

Cat No.

: SA41306

Brexpiprazole, Impurities

Brexpiprazole Piperazine Quinoline Impurity

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CAS No.

: 1849603-58-2

Mol F.

: C17H23N3O2

Mol W.

: 301.4

Cat No.

: SA41333

Brexpiprazole, Impurities

Brexpiprazole Spiro Analog | CAS : 2143944-65-2

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CAS No.

: 2143944-65-2

Mol F.

: 353.32

Mol W.

: C16H21BrN2S

Cat No.

: SA41342

Brexpiprazole, Impurities

Brexpiprazole Sulfone

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CAS No.

: NA

Mol F.

: C25H27N3O4S

Mol W.

: 465.56

Cat No.

: SA41302

Brexpiprazole, Impurities

Brexpiprazole Sulfoxide

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CAS No.

: 1191900-51-2

Mol F.

: C25H27N3O3S

Mol W.

: 449.57

Cat No.

: SA41301

Brimonidine, Impurities

Brimonidine Carbamothioate Impurity

$250.00 25 mg

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CAS No.

: 842138-75-4

Mol F.

: C11H10BrN3OS

Mol W.

: 312.19

Cat No.

: SA20713

Brimonidine, Impurities

Brimonidine N,N-Methylene Dimer

$1,250.00 25 mg

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CAS No.

Mol F.

: C23H20Br2N10

Mol W.

: 596.28

Cat No.

: SA20714

Brinzolamide, Impurities

Brinzolamide

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CAS No.

: 138890-62-7

Mol F.

: C12H21N3O5S3

Mol W.

: 383.51

Cat No.

: SA47200

Brinzolamide, Impurities

Brinzolamide (4S)-Hydroxy Impurity

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CAS No.

: 154127-42-1

Mol F.

: C10H16N2O6S3

Mol W.

: 356.44

Cat No.

: SA47205

Brinzolamide, Impurities

Brinzolamide Hydroxy Impurity (R)-Isomer

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CAS No.

: 165117-54-4

Mol F.

: C10H16N2O6S3

Mol W.

: 356.44

Cat No.

: SA47209

Brinzolamide, Impurities

Brinzolamide Methanesulfonyl Amide Impurity

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CAS No.

: NA

Mol F.

: C13H23N3O7S4

Mol W.

: 461.6

Cat No.

: SA47202

Brivaracetam, Impurities

Brivaracetam Impurity B

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CAS No.

: 2253826-01-4 (Free Base)

Mol F.

: C15H30N2O3

Mol W.

: 286.4

Cat No.

: SA47308

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

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CAS No.

: 51333-22-3

Mol F.

: C25H34O6

Mol W.

: 430.5

Cat No.

: SA14100

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