4-Amino-5-methyl-4H-1,2,4-triazole-3-thiol

Also known as: 3H-1,2,4-Triazole-3-thione,4-amino-2,4-dihydro-5-methyl-, 4-amino-3-methyl-1H-1,2,4-triazole-5-thione, 4-Amino-3-mercapto-5-methyl-1,2,4-triazole, 3-Methyl-4-amino-5-mercapto-1,2,4-triazole, NSC527797

4-Amino-5-methyl-4H-1,2,4-triazole-3-thiol (CAS 20939-15-5) is a compound in the Alcohols category listed in the Jingsj chemical database. It has the molecular formula C3H6N4S and a molecular weight of 130.17200 g/mol. Key properties include a melting point of 202-205°C, a boiling point of 196.2ºC at 760 mmHg, a density of 1.69 g/cm3 and a flash point of 72.4ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 20939-15-5
Jingsj CID: J-1106240-1
Molecular Formula: C₃H₆N₄S
Molecular Weight: 130.17200 g/mol
Category: Alcohols
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	202-205°C
Boiling Point	196.2ºC at 760 mmHg
Density	1.69 g/cm3
Flash Point	72.4ºC
Exact Mass	130.03100
PSA	95.53000
LogP	0.17020
Vapor Pressure	0.404mmHg at 25°C
Refractive Index	1.803

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 4-Amino-5-methyl-4H-1,2,4-triazole-3-thiol?

The CAS number of 4-Amino-5-methyl-4H-1,2,4-triazole-3-thiol is 20939-15-5.

What are the molecular formula and molecular weight of 4-Amino-5-methyl-4H-1,2,4-triazole-3-thiol?

4-Amino-5-methyl-4H-1,2,4-triazole-3-thiol has molecular formula C3H6N4S and molecular weight 130.17200 g/mol.

What are the upstream and downstream products of 4-Amino-5-methyl-4H-1,2,4-triazole-3-thiol?

For 4-Amino-5-methyl-4H-1,2,4-triazole-3-thiol, Upstream Products: acetic acid, Thiocarbohydrazide, Ethanol; Downstream Products: 3-Hydrazino-5-methyl-4H-1,2,4-triazol-4-ylamine hydrochloride, 3-Methyl-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazol-6-amine, 3-Methyl-1H-1,2,4-triazole.

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. "4-Amino-5-methyl-4H-1,2,4-triazole-3-thiol (CAS 20939-15-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1106240-1 (accessed 2026-11-09).

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