Skip to content

Impurities & Reference Standards

API Impurities

Source 1942 api impurities for research, QC and production, documented with COA and SDS.

14,252products

1,516in stock

COA + SDSwith every lot

Reference Standard

Brimonidine 0.8 RRT Impurity

Brimonidine 0.8 RRT Impurity

Formula: C₁₅H₁₂BrN₅O₃
MW: 390.19 g/mol

In stock

Reference Standard

Brimonidine Carbamothioate Impurity chemical structure

Brimonidine Carbamothioate Impurity

CAS: 842138-75-4
Formula: C₁₁H₁₀BrN₃OS
MW: 312.19 g/mol

VQ-021879

Reference Standard

Brimonidine Impurity 12 chemical structure

Brimonidine Impurity 12

Formula: C₁₁H₉N₅
MW: 211.22 g/mol

VQ-004553

Reference Standard

Brimonidine-2,3-dione chemical structure

Brimonidine-2,3-dione

CAS: 182627-95-8
Formula: C₁₁H₁₀BrN₅O₂
MW: 324.13 g/mol

VQ-020986

Reference Standard

Brinzolamide chemical structure

CAS: 138890-62-7
Formula: C₁₂H₂₁N₃O₅S₃
MW: 383.5 g/mol

VQ-021884

Reference Standard

Brinzolamide Racemc mixture(mixture of S&R isomer) chemical structure

Brinzolamide Racemc mixture(mixture of S&R isomer)

CAS: 138890-50-3
Formula: C₁₂H₂₁N₃O₅S₃
MW: 383.5 g/mol

VQ-036024

Reference Standard

Brivanib Alaninate chemical structure

Brivanib Alaninate

CAS: 649735-63-7
Formula: C₂₂H₂₄FN₅O₄
MW: 441.5 g/mol

VQ-043078

Reference Standard

Brivaracetam (alfaR, 4R)-Isomer chemical structure

Brivaracetam (alfaR, 4R)-Isomer

CAS: 357337-00-9
Formula: C₁₁H₂₀N₂O₂
MW: 212.29 g/mol

VQ-024649

Reference Standard

Brivaracetam (alfaR,4S)-Isomer chemical structure

Brivaracetam (alfaR,4S)-Isomer

CAS: 357336-99-3
Formula: C₁₁H₂₀N₂O₂
MW: 212.29 g/mol

VQ-024647

Reference Standard

Brivaracetam acid (2R, 4R)-Isomer chemical structure

Brivaracetam acid (2R, 4R)-Isomer

CAS: 2755924-56-0
Formula: C₁₁H₁₉NO₃
MW: 213.27 g/mol

VQ-036028

Reference Standard

Brivaracetam Impurity 25 chemical structure

Brivaracetam Impurity 25

CAS: 357336-90-4
Formula: C₁₁H₁₈N₂O₃
MW: 226.27 g/mol

VQ-047626

Reference Standard

Brivaracetam Impurity 27 chemical structure

Brivaracetam Impurity 27

CAS: 2242963-07-9
Formula: C₁₇H₂₀N₂O₃
MW: 300.35 g/mol

VQ-047625

Reference Standard

Brivaracetam Impurity 55 chemical structure

Brivaracetam Impurity 55

CAS: 2179080-15-8
Formula: C₇H₁₃NO
MW: 127.18 g/mol

VQ-047629

Reference Standard

Brivaracetam Impurity 56 chemical structure

Brivaracetam Impurity 56

CAS: 143868-89-7
Formula: C₁₅H₁₉NO₃
MW: 261.32 g/mol

VQ-047628

Reference Standard

Brivaracetam Impurity 67 chemical structure

Brivaracetam Impurity 67

CAS: 2412-81-9
Formula: C₈H₁₆O₂
MW: 144.21 g/mol

VQ-047630

Reference Standard

Brivaracetam Impurity 79

Brivaracetam Impurity 79

CAS: 2752475-08-2
Formula: C₁₀H₁₉BrO₃
MW: 267.2 g/mol

VQ-036034

Reference Standard

Brivudine Alpha Anomer chemical structure

Brivudine Alpha Anomer

CAS: 78731-55-2
Formula: C₁₁H₁₃BrN₂O₅
MW: 333.13 g/mol

VQ-024659

Reference Standard

Brivudine Impurity 5

Brivudine Impurity 5

CAS: 162756-95-8
Formula: C₂₅H₁₉BrCl₂N₂O₇
MW: 610.2 g/mol

VQ-045294

Reference Standard

Bromfenac BRO-3 Dibromo Impurity chemical structure

Bromfenac BRO-3 Dibromo Impurity

CAS: 2190487-72-8
Formula: C₁₅H₈Br₃NO
MW: 457.9 g/mol

In stock

Reference Standard

Bromfenac Ethyl Ester chemical structure

Bromfenac Ethyl Ester

CAS: 102414-22-2
Formula: C₁₇H₁₆BrNO₃
MW: 362.2 g/mol

VQ-020992

Reference Standard

Bromfenac Impurity 4 (Freebase) chemical structure

Bromfenac Impurity 4 (Freebase)

CAS: 241496-82-2
Formula: C₁₄H₁₀BrNO₃
MW: 320.14 g/mol

VQ-004555

Reference Standard

Bromfenac Impurity 4 (Sodium Salt) chemical structure

Bromfenac Impurity 4 (Sodium Salt)

CAS: 241496-82-2
Formula: C₁₄H₁₀BrNO₃
MW: 320.14 g/mol

In stock

Reference Standard

Bromfenac Impurity 5 chemical structure

Bromfenac Impurity 5

CAS: 241825-87-6
Formula: C₁₅H₁₀BrNO₄
MW: 348.15 g/mol

VQ-004557

Reference Standard

Bromfenac Impurity 5 (Sodium Salt) chemical structure

Bromfenac Impurity 5 (Sodium Salt)

CAS: 1391052-54-2
Formula: C₁₅H₉BrNNaO₄
MW: 370.13 g/mol

In stock

Need a price, a spec or a custom compound?

Send us your list — product names or CAS numbers, grade, quantity and destination. Our team replies with a formal quotation, COA and lead time.

Request a quote Contact sales