L-Tryptophan

Also known as: L(-)-Tryptophan, H-Trp-OH, (S)-2-Amino-3-(3-indolyl)propionic acid, (S)-2-Amino-3-(1H-indol-3-yl)propanoic acid, Trp, L-β-3-Indolylalanine, Indole-3-alanine, Tryptophane, L-Tryptophane

L-Tryptophan (CAS 73-22-3) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C11H12N2O2 and a molecular weight of 204.23 g/mol. Key properties include a melting point of 289-290 °C (dec.)(lit.), a boiling point of 447.9±35.0 °C at 760 mmHg, a density of 1.4±0.1 g/cm3 and a flash point of 224.7±25.9 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 73-22-3
Jingsj CID: J-968171-2
Molecular Formula: C₁₁H₁₂N₂O₂
Molecular Weight: 204.23 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	289-290 °C (dec.)(lit.)
Boiling Point	447.9±35.0 °C at 760 mmHg
Density	1.4±0.1 g/cm3
Flash Point	224.7±25.9 °C
Exact Mass	204.089874
PSA	79.11000
LogP	1.04
Vapor Pressure	0.0±1.1 mmHg at 25°C
Refractive Index	1.698

Activity & Biological Data

Target	Human Endogenous Metabolite
Additional Information	[1]. Slominski A, et al. Conversion of L-tryptophan to serotonin and melatonin in human melanoma cells. FEBS Lett. 2002 Jan 30;511(1-3):102-6.

Customs & Trade Information

HS Code	2933990090
Summary	2933990090. heterocyclic compounds with nitrogen hetero-atom(s) only. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of L-Tryptophan?

The CAS number of L-Tryptophan is 73-22-3.

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

L-Tryptophan has molecular formula C11H12N2O2 and molecular weight 204.23 g/mol.

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

For L-Tryptophan, Upstream Products: DL-Tryptophan, Indole-3-pyruvic acid, N-[(9H-fluoren-9-ylmethoxy)carbonyl]-L-tryptophan; Downstream Products: 1-Ethyl-2,3,4,9-tetrahydro-1H-β-carboline-3-carboxylic acid, 1-(trifluoromethyl)-9H-pyrido[3,4-b]indole, Indole.

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-Tryptophan (CAS 73-22-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-968171-2 (accessed 2026-11-07).

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