Benzopurpurine 4B

Also known as: Direct Red 2, C.I. 23500, Sultan Red 4B, Benzopurpurin 4B, Purpurine 4B, Victoria Red, Disodium 3,3'-[(3,3'-dimethylbiphenyl-4,4'-diyl)di(E)diazene-2,1-diyl]bis(4-aminonaphthalene-1-sulfonate), 3,3'-[(3,3'-Dimethyl[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[4-amino-1-naphthalenesulfonic Acid] Disodium Salt, MFCD00012410, EINECS 213-594-3

Benzopurpurine 4B (CAS 992-59-6) is a compound in the Aromatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C34H26N6Na2O6S2 and a molecular weight of 724.716 g/mol. Key property: a melting point of ca. 290ºC (decomposes). No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 992-59-6
Jingsj CID: J-1139-4
Molecular Formula: C₃₄H₂₆N₆Na₂O₆S₂
Molecular Weight: 724.716 g/mol
Category: Aromatic Hydrocarbons
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	ca. 290ºC (decomposes)
Exact Mass	724.115051
PSA	232.64000
LogP	11.40420
Additional Property	Solubility Soluble in water, ethanol, acetone, sodium hydroxide, sulfuric acid

Frequently Asked Questions

What is the CAS number of Benzopurpurine 4B?

The CAS number of Benzopurpurine 4B is 992-59-6.

What are the molecular formula and molecular weight of Benzopurpurine 4B?

Benzopurpurine 4B has molecular formula C34H26N6Na2O6S2 and molecular weight 724.716 g/mol.

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. "Benzopurpurine 4B (CAS 992-59-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1139-4 (accessed 2026-11-06).

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