Synonyms: 2-Butenoicacid,4-[3a,4,5,7,10,11-hexahydro-8,9-dihydroxy-3,3,11-trimethyl-13-(3-methyl-2-butenyl)-11-(4-methyl-3-pentenyl)-7,15-dioxo-1,5-methano-1H,3H,9H-furo[3,4-g]pyrano[3,2-b]xanthen-1-yl]-2-methyl-(9CI); 1,5-Methano-1H,3H,9H-furo[3,4-g]pyrano[3,2-b]xanthene, 2-butenoic acidderiv.; Neogambogic acid