Skip to content

Impurities & Reference Standards

Pharmacopeial Impurities (EP / USP / BP)

578 pharmacopeial impurities (ep / usp / bp) with CAS numbers, structures and specifications — batch COA and GHS SDS supplied.

4,399products

427in stock

COA + SDSwith every lot

Reference Standard

Chlorhexidine Diacetate EP Impurity B chemical structure

Chlorhexidine Diacetate EP Impurity B

CAS: 1308292-89-8
Formula: C₁₆H₂₆ClN₉O
MW: 395.9 g/mol

VQ-021131

Reference Standard

Chlorhexidine Diacetate EP Impurity E Hydrochloride chemical structure

Chlorhexidine Diacetate EP Impurity E Hydrochloride

CAS: 14279-91-5
Formula: C₇H₉Cl₂N₃
MW: 206.07 g/mol

VQ-047752

Reference Standard

Chlorhexidine Diacetate EP Impurity G chemical structure

Chlorhexidine Diacetate EP Impurity G

CAS: 152504-09-1
Formula: C₁₄H₂₃ClN₆
MW: 310.82 g/mol

VQ-036244

Reference Standard

Chlorhexidine Diacetate EP Impurity K chemical structure

Chlorhexidine Diacetate EP Impurity K

CAS: 1381962-77-1
Formula: C₂₂H₂₉Cl₂N₉O
MW: 506.4 g/mol

VQ-022142

Reference Standard

Chlorhexidine dihydrochloride EP Impurity C

Chlorhexidine dihydrochloride EP Impurity C

CAS: 62247-48-7
Formula: C₂₂H₂₈Cl₂N₈O₂
MW: 507.42 g/mol

VQ-024928

Reference Standard

Chlorhexidine EP Impurity E chemical structure

Chlorhexidine EP Impurity E

CAS: 45964-97-4
Formula: C₇H₈ClN₃
MW: 169.61 g/mol

VQ-022140

Reference Standard

Chlorhexidine EP Impurity F chemical structure

Chlorhexidine EP Impurity F

CAS: 140-38-5
Formula: C₇H₇ClN₂O
MW: 170.59 g/mol

In stock

Reference Standard

Chlorhexidine EP Impurity G chemical structure

Chlorhexidine EP Impurity G

CAS: 165678-61-5
Formula: C₁₄H₂₃ClN₆
MW: 310.82 g/mol

VQ-022141

Reference Standard

Chlorhexidine EP Impurity M chemical structure

Chlorhexidine EP Impurity M

CAS: 152504-12-6
Formula: C₂₂H₃₁ClN₁₀
MW: 471 g/mol

VQ-021130

Reference Standard

Chlorhexidine EP Impurity O chemical structure

Chlorhexidine EP Impurity O

CAS: 2508008-02-2
Formula: C₂₂H₃₀Cl₂N₁₀
MW: 505.4 g/mol

VQ-024927

Reference Standard

Chlormadinone Acetate EP Impurity A (Free Base) chemical structure

Chlormadinone Acetate EP Impurity A (Free Base)

CAS: 2477-73-8
Formula: C₂₃H₃₁ClO₄
MW: 406.9 g/mol

VQ-022144

Reference Standard

Chlormadinone Acetate EP Impurity E chemical structure

Chlormadinone Acetate EP Impurity E

CAS: 15251-04-4
Formula: C₂₃H₂₉BrO₄
MW: 449.4 g/mol

VQ-022145

Reference Standard

Chlormadinone Acetate EP Impurity F chemical structure

Chlormadinone Acetate EP Impurity F

CAS: 1172-82-3
Formula: C₂₄H₃₄O₄
MW: 386.5 g/mol

VQ-024931

Reference Standard

Chlormadinone Acetate EP Impurity H chemical structure

Chlormadinone Acetate EP Impurity H

CAS: 1054-64-4
Formula: C₂₄H₃₄O₄
MW: 386.5 g/mol

VQ-024930

Reference Standard

Chlormadinone Acetate EP Impurity I chemical structure

Chlormadinone Acetate EP Impurity I

CAS: 4809-88-5
Formula: C₂₅H₃₅ClO₄
MW: 435 g/mol

VQ-036245

Reference Standard

Chlormadinone Acetate EP Impurity K chemical structure

Chlormadinone Acetate EP Impurity K

CAS: 425-51-4
Formula: C₂₃H₃₀O₄
MW: 370.5 g/mol

VQ-023571

Reference Standard

Chlormadinone Acetate EP Impurity L (Free Base) chemical structure

Chlormadinone Acetate EP Impurity L (Free Base)

CAS: 2658-74-4
Formula: C₂₃H₃₁ClO₄
MW: 406.9 g/mol

VQ-022143

Reference Standard

Chloroquine USP Related Compound G chemical structure

Chloroquine USP Related Compound G

CAS: 68121-48-2
Formula: C₁₈H₂₆ClN₃O
MW: 335.9 g/mol

VQ-044459

Reference Standard

Chlorphenamine EP Impurity A chemical structure

Chlorphenamine EP Impurity A

CAS: 1246816-57-8
Formula: C₁₆H₂₄ClN₃
MW: 293.83 g/mol

VQ-022152

Reference Standard

Chlorphenamine EP Impurity A Dihydrochloride Salt chemical structure

Chlorphenamine EP Impurity A Dihydrochloride Salt

CAS: 2575516-39-9
Formula: C₁₆H₂₆Cl₃N₃
MW: 366.8 g/mol

VQ-024936

Reference Standard

Chlorphenamine EP Impurity C chemical structure

Chlorphenamine EP Impurity C

CAS: 20619-12-9
Formula: C₁₅H₁₇ClN₂
MW: 260.76 g/mol

In stock

Reference Standard

Chlorphenamine EP Impurity D chemical structure

Chlorphenamine EP Impurity D

CAS: 65676-21-3
Formula: C₁₇H₁₈ClN₃
MW: 299.8 g/mol

VQ-022151

Reference Standard

Chlorphenamine EP Impurity D chemical structure

Chlorphenamine EP Impurity D

CAS: 2575516-46-8
Formula: C₁₇H₁₉Cl₂N₃
MW: 336.3 g/mol

VQ-047758

Reference Standard

Chlorpromazine EP Impurity A chemical structure

Chlorpromazine EP Impurity A

CAS: 969-99-3
Formula: C₁₇H₁₉ClN₂OS
MW: 334.9 g/mol

VQ-022157

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