4-Amino-5-methoxy-2-methylbenzenesulfonic acid

4-氨基-5-甲氧基-2-甲基苯磺酸

Also known as: 3-Amino-4-methoxy-toluene-6-sulfonic acid, 5-amino-4-methoxy-2-methylbenzenesulfonic acid, 4-Amino-5-methoxy-2-toluenesulfonic acid, Cresidine sulfonic acid, p-Cresidine-o-sulfonic acid, 4-Cresidine-o-sulfonic acid, Para cresidine o-sulfonic acid

4-Amino-5-methoxy-2-methylbenzenesulfonic acid (CAS 6471-78-9) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C8H11NO4S and a molecular weight of 217.242 g/mol. It is also known as 3-Amino-4-methoxy-toluene-6-sulfonic acid, 5-amino-4-methoxy-2-methylbenzenesulfonic acid and 4-Amino-5-methoxy-2-toluenesulfonic acid. Key properties include a melting point of >205ºC (dec.) and a density of 1.4±0.1 g/cm3. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 6471-78-9
Jingsj CID: J-1101299-3
Molecular Formula: C₈H₁₁NO₄S
Chinese Name: 4-氨基-5-甲氧基-2-甲基苯磺酸
Molecular Weight: 217.242 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	>205ºC (dec.)
Density	1.4±0.1 g/cm3

Frequently Asked Questions

What is the CAS number of 4-Amino-5-methoxy-2-methylbenzenesulfonic acid?

The CAS number of 4-Amino-5-methoxy-2-methylbenzenesulfonic acid is 6471-78-9.

What are the molecular formula and molecular weight of 4-Amino-5-methoxy-2-methylbenzenesulfonic acid?

4-Amino-5-methoxy-2-methylbenzenesulfonic acid has molecular formula C8H11NO4S and molecular weight 217.242 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-Amino-5-methoxy-2-methylbenzenesulfonic acid (CAS 6471-78-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1101299-3 (accessed 2026-10-24).

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