6129-34-6 8,12-Methano-2H-furo(3,2-g)pyrano(2,3-a)xanthene-10a(11H)-crotonic acid, 8,9,12,14-tetrahydro-5-hydroxy-alpha,2,9,9-tetramethyl-6-(3-methyl-2-butenyl)-2-(4-methyl-3-pentenyl)-11,14-dioxo- Allogambogic acid