3-(Methylseleno)-L-alanine

Also known as: Se-Methylselenocysteine, Se-Methyl-L-selenocysteine, Se-methylseleno-L-cysteine, SEMC, Methylselenocysteine, L-Se-methylselenocysteine, 3-(Methylselanyl)-L-alanine, L-Alanine, 3-(methylseleno)-, MFCD00800565, Selenium-methylselenocystine, (2S)-2-amino-3-methylselanylpropanoic acid, (S)-2-amino-3-(methylseleno)propanoic acid

3-(Methylseleno)-L-alanine (CAS 26046-90-2) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C4H9NO2Se and a molecular weight of 182.080 g/mol. Key properties include a melting point of 177 °C(dec.), a boiling point of 314.1±37.0 °C at 760 mmHg and a flash point of 143.7±26.5 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 26046-90-2
Jingsj CID: J-1390-1
Molecular Formula: C₄H₉NO₂Se
Molecular Weight: 182.080 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	177 °C(dec.)
Boiling Point	314.1±37.0 °C at 760 mmHg
Flash Point	143.7±26.5 °C
Exact Mass	182.979858
PSA	63.32000
LogP	-0.89
Vapor Pressure	0.0±1.4 mmHg at 25°C
Storage Conditions	-20℃

Activity & Biological Data

Additional Information	[1]. Yeo JK, et al. Se-methylselenocysteine induces apoptosis through caspase activation and Bax cleavage mediated by calpain in SKOV-3 ovarian cancer cells. Cancer Lett. 2002 Aug 8;182(1):83-92. [2]. Cao S, et al. Se-methylselenocysteine offers selective protection against toxicity and potentiates the antitumour activity of anticancer drugs in preclinical animal models. Br J Cancer. 2014 Apr 2;110(7):1733-43. [3]. Xie Y, et al. Se-Methylselenocysteine Ameliorates Neuropathology and Cognitive Deficits by Attenuating Oxidative Stress and Metal Dyshomeostasis in Alzheimer Model Mice. Mol Nutr Food Res. 2018 Jun;62(12):e1800107.

Additional Information

[1]. Yeo JK, et al. Se-methylselenocysteine induces apoptosis through caspase activation and Bax cleavage mediated by calpain in SKOV-3 ovarian cancer cells. Cancer Lett. 2002 Aug 8;182(1):83-92. [2]. Cao S, et al. Se-methylselenocysteine offers selective protection against toxicity and potentiates the antitumour activity of anticancer drugs in preclinical animal models. Br J Cancer. 2014 Apr 2;110(7):1733-43. [3]. Xie Y, et al. Se-Methylselenocysteine Ameliorates Neuropathology and Cognitive Deficits by Attenuating Oxidative Stress and Metal Dyshomeostasis in Alzheimer Model Mice. Mol Nutr Food Res. 2018 Jun;62(12):e1800107.

Customs & Trade Information

HS Code	2922499990
Summary	HS:2922499990 other amino-acids, other than those containing more than one kind of oxygen function, and their esters; salts thereof VAT:17.0% Tax rebate rate:9.0% Supervision conditions:AB(certificate of inspection for goods inward,certificate of inspection for goods outward) MFN tariff:6.5% General tariff:30.0%

Frequently Asked Questions

What is the CAS number of 3-(Methylseleno)-L-alanine?

The CAS number of 3-(Methylseleno)-L-alanine is 26046-90-2.

What are the molecular formula and molecular weight of 3-(Methylseleno)-L-alanine?

3-(Methylseleno)-L-alanine has molecular formula C4H9NO2Se and molecular weight 182.080 g/mol.

What are the upstream and downstream products of 3-(Methylseleno)-L-alanine?

For 3-(Methylseleno)-L-alanine, Upstream Products: Dimethyldiselenide, 3-Chloro-L-alanine hydrochloride, iodomethane; Downstream Products: Pyruvic acid, 3-(Methylseleno)alanine.

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. "3-(Methylseleno)-L-alanine (CAS 26046-90-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1390-1 (accessed 2026-11-09).

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