4-Acetyl-L-phenylalanine

4-乙酰基-L-苯丙氨酸

Also known as: (2S)-3-(4-acetylphenyl)-2-aminopropanoic acid, (S)-3-(4-Acetylphenyl)-2-aminopropanoic acid, 4-Acetylphenylalanine, H-Phe(4-Ac)-OH, L-4-Acetylphenylalanine, L-4-Acetylphenylalanine (contains up to 20% inorganics), L-Phe(4-Ac)-OH, L-PHE(4-COCH3), L-Phenylalanine, 4-acetyl-, p-Acetyl-L-phenylalanine, p-Acetyl-phenylalanin, p-acetyl phenylalanine, para-acetyl-L-phenylalanine, Phenylalanine, 4-acetyl-

4-Acetyl-L-phenylalanine (CAS 122555-04-8) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C11H13NO3 and a molecular weight of 207.226 g/mol. It is also known as (2S)-3-(4-acetylphenyl)-2-aminopropanoic acid, (S)-3-(4-Acetylphenyl)-2-aminopropanoic acid and 4-Acetylphenylalanine. Key properties include a boiling point of 396.7±37.0 °C at 760 mmHg, a density of 1.2±0.1 g/cm3 and a flash point of 193.7±26.5 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 122555-04-8
Jingsj CID: J-1700-8
Molecular Formula: C₁₁H₁₃NO₃
Chinese Name: 4-乙酰基-L-苯丙氨酸
Molecular Weight: 207.226 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	396.7±37.0 °C at 760 mmHg
Density	1.2±0.1 g/cm3
Flash Point	193.7±26.5 °C
Exact Mass	207.089539
PSA	80.39000
LogP	0.56
Vapor Pressure	0.0±1.0 mmHg at 25°C
Refractive Index	1.571

Activity & Biological Data

Additional Information	[1]. Tang H, et al. Recent Technologies for Genetic Code Expansion and their Implications on Synthetic Biology Applications. J Mol Biol. 2022 Apr 30;434(8):167382. [2]. Volkwein W, et al. A Versatile Toolbox for the Control of Protein Levels Using Nε-Acetyl-l-lysine Dependent Amber Suppression. ACS Synth Biol. 2017 Oct 20;6(10):1892-1902. [3]. Liu H, Wang L, Brock A, Wong CH, Schultz PG. A method for the generation of glycoprotein mimetics. J Am Chem Soc. 2003 Feb 19;125(7):1702-3.

Additional Information

[1]. Tang H, et al. Recent Technologies for Genetic Code Expansion and their Implications on Synthetic Biology Applications. J Mol Biol. 2022 Apr 30;434(8):167382. [2]. Volkwein W, et al. A Versatile Toolbox for the Control of Protein Levels Using Nε-Acetyl-l-lysine Dependent Amber Suppression. ACS Synth Biol. 2017 Oct 20;6(10):1892-1902. [3]. Liu H, Wang L, Brock A, Wong CH, Schultz PG. A method for the generation of glycoprotein mimetics. J Am Chem Soc. 2003 Feb 19;125(7):1702-3.

Frequently Asked Questions

What is the CAS number of 4-Acetyl-L-phenylalanine?

The CAS number of 4-Acetyl-L-phenylalanine is 122555-04-8.

What are the molecular formula and molecular weight of 4-Acetyl-L-phenylalanine?

4-Acetyl-L-phenylalanine has molecular formula C11H13NO3 and molecular weight 207.226 g/mol.

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

Last updated: 8/21/2026

How to cite: Jingsj. "4-Acetyl-L-phenylalanine (CAS 122555-04-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1700-8 (accessed 2026-10-28).

Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.