L-Theanine

Also known as: N-Ethyl-L-glutamine, Nγ-Ethyl-L-glutamine, N5-ethyl-L-glutamine, L-Glutamic acid γ-(ethylamide), Theanine, Suntheanine, L-γ-Glutamylethylamide, N5-Ethyl-L-glutamine, N-Ethyl-L-glutamin, (S)-2-Amino-4-(N-ethylcarbamoyl)butanoic acid, H-GLN(ET)-OH

L-Theanine (CAS 3081-61-6) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C7H14N2O3 and a molecular weight of 174.198 g/mol. Key properties include a melting point of 207°C, a boiling point of 430.2±40.0 °C at 760 mmHg, a density of 1.2±0.1 g/cm3 and a flash point of 214.0±27.3 °C. It is classified under GHS with signal word Warning and hazard statements H317 — May cause an allergic skin reaction. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 3081-61-6
Jingsj CID: J-1990672-0
Molecular Formula: C₇H₁₄N₂O₃
Molecular Weight: 174.198 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	207°C
Boiling Point	430.2±40.0 °C at 760 mmHg
Density	1.2±0.1 g/cm3
Flash Point	214.0±27.3 °C
Exact Mass	174.100449
PSA	92.42000
LogP	-1.02
Vapor Pressure	0.0±2.2 mmHg at 25°C
Refractive Index	1.492

GHS Safety & Compliance

IrritantSignal word: Warning

H317 — May cause an allergic skin reaction

Activity & Biological Data

Additional Information	[1]. Vuong QV, et al. L-Theanine: properties, synthesis and isolation from tea. J Sci Food Agric. 2011 Aug 30;91(11):1931-9. [2]. Kimura K, et al. L-Theanine reduces psychological and physiological stress responses. Biol Psychol. 2007 Jan;74(1):39-45. [3]. Takeshima M, et al. l-Theanine protects against excess dopamine-induced neurotoxicity in the presence of astrocytes. J Clin Biochem Nutr. 2016 Sep;59(2):93-99.

Additional Information

[1]. Vuong QV, et al. L-Theanine: properties, synthesis and isolation from tea. J Sci Food Agric. 2011 Aug 30;91(11):1931-9. [2]. Kimura K, et al. L-Theanine reduces psychological and physiological stress responses. Biol Psychol. 2007 Jan;74(1):39-45. [3]. Takeshima M, et al. l-Theanine protects against excess dopamine-induced neurotoxicity in the presence of astrocytes. J Clin Biochem Nutr. 2016 Sep;59(2):93-99.

Customs & Trade Information

HS Code	2924199090
Summary	2924199090. other acyclic amides (including acyclic carbamates) and their derivatives; salts thereof. 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 L-Theanine?

The CAS number of L-Theanine is 3081-61-6.

What are the molecular formula and molecular weight of L-Theanine?

L-Theanine has molecular formula C7H14N2O3 and molecular weight 174.198 g/mol.

Is L-Theanine hazardous?

L-Theanine has GHS signal word Warning and hazard statements H317 — May cause an allergic skin reaction.

What are the upstream and downstream products of L-Theanine?

For L-Theanine, Upstream Products: Ethylamine, L-Glutamic acid, Methylamine hydrochloride; Downstream Products: L-Glutamic acid, Ethylamine.

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. "L-Theanine (CAS 3081-61-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1990672-0 (accessed 2026-11-09).

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