C.I.Direct Black 51

直接耐晒灰3B

Also known as: 3-[[4-[(7-Amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo]-1-naphthalenyl]azo]-2,6-dihydroxybenzoic acid disodium salt, 3-[4-[1-Hydroxy-3-(sodiooxysulfonyl)-7-aminonaphthalene-2-ylazo]naphthalene-1-ylazo]-2,6-dihydroxybenzoic acid sodium salt, Benzoic acid, 3-((4-((7-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo)-1-naphthalenyl)azo)-2,6-dihydroxy-, disodium salt, Benzoic acid, 3-(2-(4-(2-(7-amino-1-hydroxy-3-sulfo-2-naphthalenyl)diazenyl)-1-naphthalenyl)diazenyl)-2,6-dihydroxy-, sodium salt (1:2), Direct Fast Grey BN, disodium, (3Z)-6-amino-3-[[4-[(2E)-2-(3-carboxy-2-oxido-4-oxocyclohexa-2,5-dien-1-ylidene)hydrazinyl]naphthalen-1-yl]hydrazinylidene]-4-oxonaphthalene-2-sulfonate

C.I.Direct Black 51 (CAS 72207-95-5) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C27H17N5Na2O8S and a molecular weight of 617.49700 g/mol. It is also known as 3-[[4-[(7-Amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo]-1-naphthalenyl]azo]-2,6-dihydroxybenzoic acid disodium salt, 3-[4-[1-Hydroxy-3-(sodiooxysulfonyl)-7-aminonaphthalene-2-ylazo]naphthalene-1-ylazo]-2,6-dihydroxybenzoic acid sodium salt and Benzoic acid, 3-((4-((7-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo)-1-naphthalenyl)azo)-2,6-dihydroxy-, disodium salt. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.

72207-95-5

Jingsj CID

J-930135-1

Molecular Formula

C₂₇H₁₇N₅Na₂O₈S

Chinese Name

直接耐晒灰3B

Molecular Weight

617.49700 g/mol

Category

Organic Compounds

Last updated

8/21/2026