The molecule is a ring assembly compound consisting of two flaviolin units joined by a 3,3'-linkage. It derives from a flaviolin. It is a conjugate acid of a 3,3'-biflaviolin 2,2'-diolate.
4,5,7-trihydroxy-3-(1,6,8-trihydroxy-3,4-dioxonaphthalen-2-yl)naphthalene-1,2-dione