acid fuchsin(2-)
acid fuchsin(2-)
An organosulfonate oxoanion obtained by the removal of two protons from 2-amino-5-[(4-amino-3-sulfophenyl)(4-imino-3-sulfocyclohexa-2,5-dien-1-ylidene)methyl]-3-methylbenzene-1-sulfonic acid (the free acid form of the biological stain 'acid fuchsin').