The molecule is a flavonoid oxoanion that is a trianionic form of 3,8'-biflaviolin. It is the major microspecies at pH 7.3 (according to Marvin v 6.2.0.). It is a conjugate base of a 3,8'-biflaviolin 2,2'-diolate.
4-(6,8-dihydroxy-1-oxido-3,4-dioxonaphthalen-2-yl)-3-hydroxy-5,6-dioxonaphthalene-1,8-diolate