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

Bromfenac Impurity 6 chemical structure

Bromfenac Impurity 6

CAS: 241825-88-7
Formula: C₁₅H₈BrNO₃
MW: 330.13 g/mol

In stock

Reference Standard

Bromfenac Impurity B (Sodium Salt) chemical structure

Bromfenac Impurity B (Sodium Salt)

CAS: 126849-31-8
Formula: C₁₅H₁₀NNaO₄
MW: 291.23 g/mol

In stock

Reference Standard

Bromfenac Methyl Ester chemical structure

Bromfenac Methyl Ester

CAS: 2445168-29-4
Formula: C₁₆H₁₄BrNO₃
MW: 348.19 g/mol

VQ-029527

Reference Standard

Bromfenac Sodium Imp -B chemical structure

Bromfenac Sodium Imp -B

CAS: 91713-90-5
Formula: C₁₆H₁₂BrNO₂S
MW: 362.2 g/mol

VQ-020991

Reference Standard

Bromocriptine 2-Methylbutyl Analogue chemical structure

Bromocriptine 2-Methylbutyl Analogue

CAS: 157135-98-3
Formula: C₃₃H₄₂BrN₅O₅
MW: 668.6 g/mol

VQ-029528

Reference Standard

Bromocriptine Impurity 3

Bromocriptine Impurity 3

CAS: 82796-58-5
Formula: C₃₂H₄₀BrN₅O₅
MW: 654.59 g/mol

VQ-047636

Reference Standard

Bromofenac N-Beta-D-Glucoside chemical structure

Bromofenac N-Beta-D-Glucoside

CAS: 212266-82-5
Formula: C₂₁H₂₂BrNO₈
MW: 496.3 g/mol

VQ-035326

Reference Standard

Bromoperidol Decanoate chemical structure

Bromoperidol Decanoate

CAS: 75067-66-2
Formula: C₃₁H₄₁BrFNO₃
MW: 574.6 g/mol

VQ-026046

Reference Standard

Bromopride Impurity B chemical structure

Bromopride Impurity B

CAS: 4093-34-9
Formula: C₁₁H₁₂BrNO₄
MW: 302.12 g/mol

VQ-020993

Reference Standard

Bromopride Impurity C chemical structure

Bromopride Impurity C

CAS: 35290-97-2
Formula: C₈H₈BrNO₃
MW: 246.06 g/mol

VQ-021904

Reference Standard

Brompromazine

CAS: 1757-73-9
Formula: C₁₇H₁₉BrN₂S
MW: 363.32 g/mol

VQ-036045

Reference Standard

Brompromazine Hydrochloride chemical structure

Brompromazine Hydrochloride

CAS: 15502-93-9
Formula: C₁₇H₂₀BrClN₂S
MW: 399.8 g/mol

VQ-029757

Reference Standard

Budesonide 17-Carboxylic Acid chemical structure

Budesonide 17-Carboxylic Acid

CAS: 192057-49-1
Formula: C₂₄H₃₂O₆
MW: 416.5 g/mol

VQ-021007

Reference Standard

Budesonide Impurity chemical structure

Budesonide Impurity

CAS: 910299-74-0
Formula: C₁₉H₂₄O₄
MW: 316.4 g/mol

VQ-021915

Reference Standard

Budesonide Impurity (RRT-1.1) chemical structure

Budesonide Impurity (RRT-1.1)

CAS: 85234-64-6
Formula: C₂₃H₃₀O₅
MW: 386.5 g/mol

VQ-004561

Reference Standard

Budesonide Impurity 11 chemical structure

Budesonide Impurity 11

CAS: 3949-79-9
Formula: C₂₃H₂₈O₇
MW: 416.5 g/mol

VQ-028925

Reference Standard

Budesonide Impurity 4 chemical structure

Budesonide Impurity 4

CAS: 77017-17-5
Formula: C₂₁H₂₆O₅
MW: 358.4 g/mol

VQ-035000

Reference Standard

Budesonide Propionaldehyde Impurity chemical structure

Budesonide Propionaldehyde Impurity

CAS: 68293-09-4
Formula: C₂₄H₃₂O₆
MW: 416.5 g/mol

VQ-044160

Reference Standard

Buflomedil Hydrochloride - Impurity B (FreeBase) chemical structure

Buflomedil Hydrochloride - Impurity B (FreeBase)

CAS: 79967-07-0
Formula: C₁₆H₂₃NO₄
MW: 293.36 g/mol

VQ-043854

Reference Standard

Buprenorphine Related Compound A CII(Secondary Standards traceble to USP) chemical structure

Buprenorphine Related Compound A CII(Secondary Standards traceble to USP)

CAS: 457071-73-7
Formula: C₂₉H₄₁NO₄
MW: 467.6 g/mol

VQ-035514

Reference Standard

Bupropion (S)-Isomer Hydrochloride chemical structure

Bupropion (S)-Isomer Hydrochloride

CAS: 324548-45-0
Formula: C₁₃H₁₉Cl₂NO
MW: 276.2 g/mol

VQ-036053

Reference Standard

Bupropion 2-Bromo Impurity chemical structure

Bupropion 2-Bromo Impurity

CAS: 34911-51-8
Formula: C₉H₈BrClO
MW: 247.51 g/mol

VQ-004562

Reference Standard

Bupropion 3,5-Dichloro Impurity chemical structure

Bupropion 3,5-Dichloro Impurity

CAS: 1193779-48-4
Formula: C₁₃H₁₇Cl₂NO
MW: 274.18 g/mol

VQ-024697

Reference Standard

Bupropion Deschloro-3'-2 bromo impurity chemical structure

Bupropion Deschloro-3'-2 bromo impurity

CAS: 76650-08-3
Formula: C₉H₈Br₂O
MW: 291.97 g/mol

VQ-024699

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