The Eriochrome black T, with the CAS registry number 1787-61-7, has the IUPAC name of (4Z)-4-[(1-hydroxynaphthalen-2-yl)hydrazinylidene]-7-nitro-3-oxonaphthalene-1-sulfonic acidis. For being a kind of black powder, this is soluble in water while slightly soluble in alcohol and acetone, and it is stable chemically but incompatible with strong oxidizing agents, strong reducing agents. Besides, its product categories are including Dyes and Pigments; Analytical Chemistry; Azo Compounds; Chelating Reagents; Naphthylazo Compounds.

The characteristics of this chemical are as follows: (1)#H bond acceptors: 10; (2)#H bond donors: 3; (3)#Freely Rotating Bonds: 6; (4)Polar Surface Area: 176.58; (5)Exact Mass: 439.04742; (6)MonoIsotopic Mass: 439.04742; (7)Topological Polar Surface Area: 170; (8)Heavy Atom Count: 31; (9)Complexity: 905; (10)Covalently-Bonded Unit Count: 1.

When you are dealing with this chemical, you should be very cautious. For being a kind of irritant chemical, it is irritating to eyes, respiratory system and skin and may cause inflammation to the skin or other mucous membranes. Therefore, you should take the following instructions to protect youself. Wear suitable gloves and eye/face protection. And if in case of contact with eyes, rinse immediately with plenty of water and seek medical advice

As to its usage, it is widely applied in many ways. It could be used in dyeing and printing of wool fabric and also in dyeing of silk and nylon; Then it could be used in the leather dyeing. In addition, it could then be used in dyeing of wool top, knitting wool, and all other textiles.

In addition, you could convert the following datas into the molecular structure:
(1)Canonical SMILES: C1=CC=C2C(=C1)C=CC(=C2O)NN=C3C4=C(C=C(C=C4)[N+](=O)[O-])C(=CC3=O)S(=O)(=O)O
(2)Isomeric SMILES: C1=CC=C2C(=C1)C=CC(=C2O)N/N=C\3/C4=C(C=C(C=C4)[N+](=O)[O-])C(=CC3=O)S(=O)(=O)O
(3)InChI: InChI=1S/C20H13N3O7S/c24-17-10-18(31(28,29)30)15-9-12(23(26)27)6-7-14(15)19(17)22-21-16-8-5-11-3-1-2-4-13(11)20(16)25/h1-10,21,25H,(H,28,29,30)/b22-19-
(4)InChIKey: HXCVORTXAHFAHC-QOCHGBHMSA-N 

Below are the toxicity information of this chemical: