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Azure C

天青C

Also known as: 3-Amino-7-(methylamino)phenothiazin-5-ium chloride, Monomethylthionine, Methylene Azure C, C.I. 52002, N-Methylthionine, Azure C, biological stain, AZURE C MACNEAL

Azure C (CAS 531-57-7) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C13H12ClN3S and a molecular weight of 277.77 g/mol. It is also known as 3-Amino-7-(methylamino)phenothiazin-5-ium chloride, Monomethylthionine and Methylene Azure C. Key properties include a boiling point of 385.1ºC at 760 mmHg and a flash point of 186.7ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
531-57-7
Jingsj CID
J-1990778-1
Molecular Formula
C13H12ClN3S
Chinese Name
天青C
Molecular Weight
277.77 g/mol
Category
Organic Compounds
Last updated
8/21/2026

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Physicochemical Properties

Boiling Point385.1ºC at 760 mmHg
Flash Point186.7ºC
Exact Mass277.04400
PSA79.18000
LogP1.01270

Activity & Biological Data

Additional Information[1]. Ferreira-Leitão V S, et al. Methylene blue and azure B oxidation by horseradish peroxidase: a comparative evaluation of class II and class III peroxidases. Applied Catalysis B: Environmental, 2003, 42(2): 213-221. [2]. Lo Cascio F, et al. Azure C Targets and Modulates Toxic Tau Oligomers. ACS Chem Neurosci. 2018 Jun 20;9(6):1317-1326.

Customs & Trade Information

HS Code2934300000
Summary2934300000. other compounds containing in the structure a phenothiazine ring-system (whether or not hydrogenated), not further fused. 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 Azure C?

The CAS number of Azure C is 531-57-7.

What are the molecular formula and molecular weight of Azure C?

Azure C has molecular formula C13H12ClN3S and molecular weight 277.77 g/mol.

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

Last updated:

How to cite: Jingsj. "Azure C (CAS 531-57-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1990778-1 (accessed 2026-10-28).

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