Synonyms: 1,5-Methano-1H,3H,11H-furo[3,4-g]pyrano[3,2-b]xanthene-1-crotonicacid, 3a,4,5,7-tetrahydro-8-hydroxy-a,3,3,11-tetramethyl-13-(3-methyl-2-butenyl)-11-(4-methyl-3-pentenyl)-7,15-dioxo-,(Z)- (8CI); 2-Butenoic acid,2-methyl-4-[(1R,3aS,5S,11R,14aS)-3a,4,5,7-tetrahydro-8-hydroxy-3,3,11-trimethyl-13-(3-methyl-2-butenyl)-11-(4-methyl-3-pentenyl)-7,15-dioxo-1,5-methano-1H,3H,11H-furo[3,4-g]pyrano[3,2-b]xanthen-1-yl]-,(2Z)- (9CI); 2-Butenoic acid,2-methyl-4-[3a,4,5,7-tetrahydro-8-hydroxy-3,3,11-trimethyl-13-(3-methyl-2-butenyl)-11-(4-methyl-3-pentenyl)-7,15-dioxo-1,5-methano-1H,3H,11H-furo[3,4-g]pyrano[3,2-b]xanthen-1-yl]-,[1R-[1a,1(Z),3ab,5a,11b,14aS*]]-; Gambogic acid (7CI); R-Gambogic acid; b-Guttiferin