(1S,2S,3S,5S)-3-(Benzyloxy)-5-(6-(benzyloxy)-2-(((4-methoxyphenyl)diphenylmethyl)amino)-9H-purin-9-yl)-2-((benzyloxy)methyl)cyclopentan-1-ol
- CAS
- 142217-78-5
- Formula
- C52H49N5O5
- MW
- 824 g/mol
ZX-024511
Impurity reference standards
Entecavir impurity standards
For Entecavir, the Zemixal catalogue holds 20 impurity and reference standards that support release testing, stability programmes and regulatory dossiers. Counted by type, there are 6 pharmacopoeial impurities and 1 metabolite or hydroxylated analogue.
20reference materials
6pharmacopoeial
1metabolites
Each lot ships with a certificate of analysis, and characterisation data such as 1H-NMR, mass spectrum and HPLC purity can be shared before you order. They are bought for system suitability, peak identification, quantitation against limits and the impurity justification sections of regulatory submissions.
By impurity type
Pharmacopoeial6EP, USP, BP or JP named impurities
Metabolites1Hydroxy, desmethyl and conjugated forms
Counts are based on product names. One compound can fall into more than one type.
All Entecavir reference materials
1–20 of 20 standards
(1S,2S,3S,5S)-5-(2-Amino-6-(benzyloxy)-9H-purin-9-yl)-3-(benzyloxy)-2-((benzyloxy)methyl)cyclopentan-1-ol
- CAS
- 142217-77-4
- Formula
- C32H33N5O4
- MW
- 551.6 g/mol
ZX-029274
[1S-(1α,2α,3β,5α)]-3-(Phenylmethoxy)-2-[(phenylmethoxy)methyl]-6-oxabicyclo[3.1.0]hexane
- CAS
- 110567-22-1
- Formula
- C20H22O3
- MW
- 310.4 g/mol
ZX-024510
2-Amino-9-((1S,3R,4R)-4-(benzyloxy)-3-((benzyloxy)methyl)-2-methylenecyclopentyl)-1,9-dihydro-6H-purin-6-one
- CAS
- 1354695-85-4
- Formula
- C26H27N5O3
- MW
- 457.5 g/mol
ZX-024509
4-Dehydroxy-4-dimethylhydroxysilyl Entecavir
- CAS
- 870614-82-7
- Formula
- C14H21N5O3Si
- MW
- 335.43 g/mol
ZX-021571
6-(Benzyloxy)-9-((1S,3R,4S)-4-(benzyloxy)-3-((benzyloxy)methyl)-2-methylenecyclopentyl)-N-((4-methoxyphenyl)diphenylmethyl)-9H-purin-2-amine
- CAS
- 142217-80-9
- Formula
- C53H49N5O4
- MW
- 820 g/mol
ZX-029277
Questions
Entecavir impurities, answered
What Entecavir reference materials are available?
The catalogue currently lists 20 compounds for Entecavir, including 6 pharmacopoeial impurities and 1 metabolite or hydroxylated analogue. Each product page shows the CAS number where one is assigned, the structure, formula and molecular weight.
What documents come with a Entecavir impurity standard?
A certificate of analysis travels with every lot. On request we share the characterisation set, usually 1H-NMR, mass spectrum, HPLC purity and IR, and for some materials TGA or water content. Ask for the data before ordering if your QA team needs to review it.
Can Zemixal make a Entecavir impurity that is not listed?
Often yes. Send the structure, name or CAS number with the quantity you need and our sourcing team checks custom synthesis options, usually from 10 mg up to gram scale, with a quoted lead time.