The molecule is an organosulfonate oxoanion obtained by deprotonation of the sulfonate groups of Guinee green B(1+). It is a conjugate base of a Guinee green B(1+).
3-[[N-ethyl-4-[[4-[ethyl-[(3-sulfonatophenyl)methyl]azaniumylidene]cyclohexa-2,5-dien-1-ylidene]-phenylmethyl]anilino]methyl]benzenesulfonate