The molecule is conjugate base of aspulvinone H arising from selective deprotonation of the butenolide OH group; major species at pH 7.3. It is a conjugate base of an aspulvinone H.
(2Z)-4-[4-hydroxy-3-(3-methylbut-2-enyl)phenyl]-2-[[4-hydroxy-3-(3-methylbut-2-enyl)phenyl]methylidene]-5-oxofuran-3-olate