O-Phospho-L-tyrosine

Also known as: L-Phosphotyrosine, Phospho-L-tyrosine, O-Phosphotyrosine, Phosphonotyrosine, Tyrosine O-phosphate, L-Tyrosine O-phosphate, L-Tyrosine-O-phosphate, O4-phospho-L-tyrosine, PHOSPHOTYROSINE, H-Tyr(PO3H2)-OH, H-TYR(P)-OH, H-TYR(PO3H2)-OH, H-Tyr(PO3)-OH, L-3-[4-HYDROXYPHENYL]ALANINE 4'-PHOSPHATE, L-TYROSINE O-PHOSPHATE, L-Tyr-phosphate, L-tyrosine phosphate, MFCD00002603, (2S)-2-amino-3-(4-phosphonooxyphenyl)propanoic acid

O-Phospho-L-tyrosine (CAS 21820-51-9) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C9H12NO6P and a molecular weight of 261.16800 g/mol. Key properties include a melting point of 226-227ºC, a boiling point of 590.1ºC at 760 mmHg, a density of 1.63g/cm3 and a flash point of 310.7ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 21820-51-9
Jingsj CID: J-1958303-0
Molecular Formula: C₉H₁₂NO₆P
Molecular Weight: 261.16800 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	226-227ºC
Boiling Point	590.1ºC at 760 mmHg
Density	1.63g/cm3
Flash Point	310.7ºC
Exact Mass	261.04000
PSA	139.89000
LogP	0.81280
Vapor Pressure	9.05E-15mmHg at 25°C
Refractive Index	1.635
Storage Conditions	2-8°C

Activity & Biological Data

Target	Human Endogenous Metabolite
Additional Information	[1]. Luckose F, et al. Effects of amino acid derivatives on physical, mental, and physiological activities. Crit Rev Food Sci Nutr. 2015;55(13):1793-1144.

Customs & Trade Information

HS Code	2931900090
Summary	2931900090. other organo-inorganic compounds. VAT:17.0%. Tax rebate rate:13.0%. 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 O-Phospho-L-tyrosine?

The CAS number of O-Phospho-L-tyrosine is 21820-51-9.

What are the molecular formula and molecular weight of O-Phospho-L-tyrosine?

O-Phospho-L-tyrosine has molecular formula C9H12NO6P and molecular weight 261.16800 g/mol.

What are the upstream and downstream products of O-Phospho-L-tyrosine?

For O-Phospho-L-tyrosine, Upstream Products: L-Tyrosine, N-Formyl-L-tyrosine, L-Tyrosine ethyl ester hydrochloride; Downstream Products: L-Tyrosine.

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. "O-Phospho-L-tyrosine (CAS 21820-51-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1958303-0 (accessed 2026-11-09).

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