The Acid Green 16, with the CAS registry number 12768-78-4, is also known as Erio Green B. It belongs to the product category of Dyes and Pigments. This chemical's molecular formula is C₃₁H₃₃N₂NaO₆S₂ and molecular weight is 616.72. What's more, its systematic name is sodium 4-{[4-(diethylamino)phenyl][4-(diethyliminio)cyclohexa-2,5-dien-1-ylidene]methyl}naphthalene-2,7-disulfonate. It is a triarylmethane dye. It is used for printing and dyeing wool and silk.

Physical properties of Acid Green 16 are: (1)#H bond acceptors: 8; (2)#H bond donors: 2; (3)#Freely Rotating Bonds: 9; (4)Polar Surface Area: 131.75 Å².

Preparation: 4, 4 '-di(dimethyl amino)-2-benzyl alcohol and 2, 7-naphthalene acid which are used as raw materials are condensaed, and then they are oxidated and neutralized. The finished product is prepared by salting-out, filtering, drying and being shattered.

You can still convert the following datas into molecular structure:
(1)SMILES: [Na+].[O-]S(=O)(=O)c1ccc2c(c1)cc(cc2/C(=C\3/C=C\C(=[N+](\CC)CC)/C=C/3)c4ccc(N(CC)CC)cc4)S([O-])(=O)=O
(2)Std. InChI: InChI=1S/C31H34N2O6S2.Na/c1-5-32(6-2)25-13-9-22(10-14-25)31(23-11-15-26(16-12-23)33(7-3)8-4)30-21-28(41(37,38)39)20-24-19-27(40(34,35)36)17-18-29(24)30;/h9-21H,5-8H2,1-4H3,(H-,34,35,36,37,38,39);/q;+1/p-1
(3)Std. InChIKey: UWGCNDBLFSEBDW-UHFFFAOYSA-M