Isosilybin A

Name: Isosilybin A
Brand: Zemixal
SKU: ZX-033643

Reference StandardAvailable on request

Order Isosilybin A (CAS 142796-21-2) online at Zemixal. Request a quote with price, lead time and documents. Part of our API Impurities range.

Pack sizes

CAS number142796-21-2

FormulaC₂₅H₂₂O₁₀

Molar mass482.4 g/mol

Physical formSolid

HS code38229090

InChIKeyFDQAOULAVFHKBX-HKTJVKLFSA-N

IUPAC name(2R,3R)-3,5,7-trihydroxy-2-[(2R,3R)-2-(4-hydroxy-3-methoxyphenyl)-3-(hydroxymethyl)-2,3-dihydro-1,4-benzodioxin-6-yl]-2,3-dihydrochromen-4-one

About Isosilybin A

Analytical teams working on Isosilybin use Isosilybin A as a qualified comparison standard. For your records (Reference Standard), the material is defined by CAS 142796-21-2, formula C25H22O10 and molar mass 482.4 g/mol. It is handled as a solid.

Where it is used

Analytical method development
Method validation (AMV)
QC release testing
ANDA / DMF filings

Safe handling

Hazard communication follows GHS (Warning: H302). Our SDS lists exposure controls and first-aid measures.

Available as 10 mg, 25 mg, 50 mg and 100 mg. Larger or split packs can be arranged. You receive a certificate of analysis with characterisation data with each order. Request pricing online and we confirm availability, documentation and freight to your country.

Reference standards for Isosilybin

See every impurity, metabolite and related compound we list for this API.

Isosilybin standards

Typical uses

Analytical method development
Method validation (AMV)
QC release testing
ANDA / DMF filings

Applications

Pharmaceutical Manufacturing and QC Research Labs and Universities

Specifications and identifiers

Specifications of Isosilybin A
Product name	Isosilybin A
Catalogue number	ZX-033643
CAS number	142796-21-2
IUPAC name	(2R,3R)-3,5,7-trihydroxy-2-[(2R,3R)-2-(4-hydroxy-3-methoxyphenyl)-3-(hydroxymethyl)-2,3-dihydro-1,4-benzodioxin-6-yl]-2,3-dihydrochromen-4-one
Molecular formula	C₂₅H₂₂O₁₀
Molar mass	482.4 g/mol
Exact mass	482.1213
Grade	Reference Standard
Physical form	Solid
XLogP3	2.4
H-bond donors / acceptors	5 / 10
Topological polar surface area	155 Å²
HS code	38229090
InChIKey	FDQAOULAVFHKBX-HKTJVKLFSA-N
SMILES	COC1=C(C=CC(=C1)[C@@H]2[C@H](OC3=C(O2)C=CC(=C3)[C@@H]4[C@H](C(=O)C5=C(C=C(C=C5O4)O)O)O)CO)O
PubChem CID	11059920
Synonyms	Isosilibinin A, Silybin B2, 7-(4-bromobenzoyl)isosilybin A, Isosilybin AISB-A, Isosilybin A + B, Isosilybin A/(+)-Isosilybin A,Silybin b2

Lot values are stated on the batch certificate of analysis. Ask for a typical COA with your quotation.

Safety and GHS hazards

Irritant or harmful

Signal word Warning

H302Harmful if swallowed

Precautionary statements P264, P270, P301 + P317, P330, P501

Classification summarised from public GHS notifications. It can vary with grade and concentration, so always follow the SDS supplied with your lot.

Pack sizes

Pack sizes of Isosilybin A
10 mg	Quoted on request
25 mg	Quoted on request
50 mg	Quoted on request
100 mg	Quoted on request

Need a different size? Bulk drums and custom packing are quoted on request through the quote form on this page.

Questions about Isosilybin A

Which CAS number identifies Isosilybin A?

Isosilybin A is registered under CAS 142796-21-2. You may also see it listed as Isosilibinin A, Silybin B2, 7-(4-bromobenzoyl)isosilybin A. Our catalogue number for this item is ZX-033643.

What are the formula and molar mass of Isosilybin A?

For Isosilybin A, its formula is C25H22O10 and its molar mass is 482.4 g/mol. The systematic (IUPAC) name is (2R,3R)-3,5,7-trihydroxy-2-[(2R,3R)-2-(4-hydroxy-3-methoxyphenyl)-3-(hydroxymethyl)-2,3-dihydro-1,4-benzodioxin-6-yl]-2,3-dihydrochromen-4-one. InChIKey FDQAOULAVFHKBX-HKTJVKLFSA-N lets you match it in any structure database.

How is Isosilybin A used in pharmaceutical QC?

Isosilybin A is a characterised reference material linked to Isosilybin. Laboratories use it to identify and quantify this impurity during method development and validation, stability work, batch release testing and regulatory submissions.

What grade and pack sizes are available for Isosilybin A?

This listing is Reference Standard grade. Standard packs are 10 mg, 25 mg, 50 mg, 100 mg. Larger quantities and custom packing can be quoted on request.

Which documents come with Isosilybin A?

Each lot ships with a batch certificate of analysis and a 16-section GHS safety data sheet. A typical COA or specification sheet can be shared with the quotation before you order.

Can Zemixal ship Isosilybin A to my country?

Yes. Because Isosilybin A is classed as hazardous, it travels in UN-approved packaging as dangerous goods under IATA or IMDG rules, with the export paperwork your broker needs.

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