DL-Selenomethionine

Also known as: Selenomethionine, Seleno-DL-methionine, 2-Amino-4-(methylseleno)butanoic acid, 2-Amino-4-(methylselenyl)butyric acid, DL-Selenomethionine (USP), Selenium methionine

DL-Selenomethionine (CAS 1464-42-2) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C5H11NO2Se and a molecular weight of 196.106 g/mol. Key properties include a melting point of 267-269ºC, a boiling point of 320.8±37.0 °C at 760 mmHg and a flash point of 147.8±26.5 °C. It is classified under GHS with signal word Danger and hazard statements H301 — Toxic if swallowed, H331 — Toxic if inhaled and H373 — May cause damage to organs through prolonged exposure. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 1464-42-2
Jingsj CID: J-21827-9
Molecular Formula: C₅H₁₁NO₂Se
Molecular Weight: 196.106 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	267-269ºC
Boiling Point	320.8±37.0 °C at 760 mmHg
Flash Point	147.8±26.5 °C
Exact Mass	196.995499
PSA	63.32000
LogP	-0.65
Vapor Pressure	0.0±1.5 mmHg at 25°C
Storage Conditions	−20°C
Additional Property	soluble

GHS Safety & Compliance

Acute Toxicity / Health Hazard / Environmental HazardSignal word: Danger

H301 — Toxic if swallowed
H331 — Toxic if inhaled
H373 — May cause damage to organs through prolonged exposure
H410 — Very toxic to aquatic life with long lasting effects

Customs & Trade Information

HS Code	2930909090
Summary	2930909090. other organo-sulphur compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:30.0%

Frequently Asked Questions

What is the CAS number of DL-Selenomethionine?

The CAS number of DL-Selenomethionine is 1464-42-2.

What are the molecular formula and molecular weight of DL-Selenomethionine?

DL-Selenomethionine has molecular formula C5H11NO2Se and molecular weight 196.106 g/mol.

Is DL-Selenomethionine hazardous?

DL-Selenomethionine has GHS signal word Danger and hazard statements H301 — Toxic if swallowed; H331 — Toxic if inhaled; H373 — May cause damage to organs through prolonged exposure.

What are the upstream and downstream products of DL-Selenomethionine?

For DL-Selenomethionine, Upstream Products: Dimethyldiselenide, 2(3H)-Furanone,3-aminodihydro-(8CI,9CI).

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "DL-Selenomethionine (CAS 1464-42-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-21827-9 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.