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

Oxybuprocaine Hydrochloride EP Impurity B chemical structure

Oxybuprocaine Hydrochloride EP Impurity B

CAS: 23442-22-0
Formula: C₁₁H₁₅NO₃
MW: 209.24 g/mol

VQ-033009

Reference Standard

Oxybuprocaine Hydrochloride EP Impurity C chemical structure

Oxybuprocaine Hydrochloride EP Impurity C

CAS: 2374-03-0
Formula: C₇H₇NO₃
MW: 153.14 g/mol

VQ-023437

Reference Standard

Oxybutynin EP Impurity A chemical structure

Oxybutynin EP Impurity A

CAS: 1199574-71-4
Formula: C₂₂H₃₅NO₃
MW: 361.5 g/mol

VQ-027337

Reference Standard

Oxybutynin EP Impurity B chemical structure

Oxybutynin EP Impurity B

CAS: 14943-53-4
Formula: C₂₂H₂₅NO₃
MW: 351.4 g/mol

VQ-027336

Reference Standard

Oxybutynin EP Impurity C chemical structure

Oxybutynin EP Impurity C

CAS: 1199574-70-3
Formula: C₂₁H₂₉NO₃
MW: 343.5 g/mol

In stock

Reference Standard

Oxybutynin EP Impurity C (Hydrochloride Salt)

Oxybutynin EP Impurity C (Hydrochloride Salt)

Formula: C₂₁H₂₉NO₃.ClH
MW: 379.92 g/mol

VQ-006561

Reference Standard

Oxybutynin EP Impurity D chemical structure

Oxybutynin EP Impurity D

CAS: 4335-77-7
Formula: C₁₄H₁₈O₃
MW: 234.29 g/mol

VQ-033012

Reference Standard

Oxybutynin EP Impurity E chemical structure

Oxybutynin EP Impurity E

CAS: 1215677-72-7
Formula: C₂₃H₃₃NO₃
MW: 371.5 g/mol

VQ-033011

Reference Standard

Oxybutynin Hydrochloride EP Impurity C (HCl Salt) chemical structure

Oxybutynin Hydrochloride EP Impurity C (HCl Salt)

CAS: 2724511-24-2
Formula: C₂₁H₃₀ClNO₃
MW: 379.9 g/mol

VQ-043740

Reference Standard

Oxymetazolin EP Impurity A chemical structure

Oxymetazolin EP Impurity A

CAS: 1391194-44-7
Formula: C₁₆H₂₆N₂O₂
MW: 278.39 g/mol

VQ-041281

Reference Standard

Oxymetazoline EP Impurity A chemical structure

Oxymetazoline EP Impurity A

CAS: 1391053-50-1
Formula: C₁₆H₂₇ClN₂O₂
MW: 314.8 g/mol

VQ-027340

Reference Standard

Oxymetazoline EP Impurity C chemical structure

Oxymetazoline EP Impurity C

CAS: 55699-13-3
Formula: C₁₄H₂₁NO₂
MW: 235.32 g/mol

VQ-027341

Reference Standard

Oxymetazoline EP Impurity D chemical structure

Oxymetazoline EP Impurity D

CAS: 55699-12-2
Formula: C₁₄H₂₀O₃
MW: 236.31 g/mol

VQ-027342

Reference Standard

Oxymetazoline EP Impurity E chemical structure

Oxymetazoline EP Impurity E

CAS: 55699-10-0
Formula: C₁₄H₁₉NO
MW: 217.31 g/mol

VQ-027343

Reference Standard

Oxytetracycline EP Impurity A chemical structure

Oxytetracycline EP Impurity A

CAS: 14206-58-7
Formula: C₂₂H₂₄N₂O₉
MW: 460.4 g/mol

VQ-023439

Reference Standard

Oxytetracycline EP Impurity C chemical structure

Oxytetracycline EP Impurity C

CAS: 7647-65-6
Formula: C₂₃H₂₅NO₉
MW: 459.4 g/mol

VQ-023442

Reference Standard

Oxytetracycline EP Impurity D chemical structure

Oxytetracycline EP Impurity D

CAS: 18695-01-7
Formula: C₂₂H₂₂N₂O₈
MW: 442.4 g/mol

VQ-021300

Reference Standard

Oxytetracycline EP Impurity E chemical structure

Oxytetracycline EP Impurity E

CAS: 18751-99-0
Formula: C₂₂H₂₂N₂O₈
MW: 442.4 g/mol

VQ-023440

Reference Standard

Oxytetracycline EP Impurity F chemical structure

Oxytetracycline EP Impurity F

CAS: 4660-26-8
Formula: C₂₂H₂₂N₂O₈
MW: 442.4 g/mol

VQ-023441

Reference Standard

Oxytetracycline EP Impurity F HCl salt chemical structure

Oxytetracycline EP Impurity F HCl salt

CAS: 51596-09-9
Formula: C₂₂H₂₃ClN₂O₈
MW: 478.9 g/mol

VQ-033017

Reference Standard

Oxytocin EP Impurity E chemical structure

Oxytocin EP Impurity E

CAS: 10551-48-1
Formula: C₄₅H₆₈N₁₂O₁₃S₂
MW: 1049.2 g/mol

VQ-023443

Reference Standard

Oxytocin EP Impurity F

Oxytocin EP Impurity F

CAS: 87590-89-4
Formula: C₄₃H₆₄N₁₂O₁₁S₂
MW: 989.18 g/mol

VQ-027346

Reference Standard

Paclitaxel EP Impurity A chemical structure

Paclitaxel EP Impurity A

CAS: 173101-54-7
Formula: C₄₅H₅₃NO₁₄
MW: 831.9 g/mol

VQ-027358

Reference Standard

Paclitaxel EP Impurity B chemical structure

Paclitaxel EP Impurity B

CAS: 71610-00-9
Formula: C₄₅H₅₃NO₁₄
MW: 831.9 g/mol

VQ-027351

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