N-[4-[(2-Chlorophenyl)[4-[ethyl[(3-sulfophenyl)methyl]amino]phenyl]methylene]-2,5-cyclohexadien-1-ylidene]-N-ethyl-3-sulfonatobenzenemethanaminium

[4-[(2-chlorophenyl)[4-[ethyl[(3-sulphonatophenyl)methyl]ammonio]phenyl]methylene]cyclohexa-2,5-dien-1-ylidene](ethyl)(3-sulphonatobenzyl)ammonium