Synonyms: 9,4a-Propeno-4aH-fluorene-1,4-dione,9,9a-dihydro-5,8-dihydroxy-11-methyl-9a-(3-methyl-2-butenyl)-,(4aR,9R,9aS)-rel-(-)- (9CI); 9,4a-Propeno-4aH-fluorene-1,4-dione,9,9a-dihydro-5,8-dihydroxy-11-methyl-9a-(3-methyl-2-butenyl)-, (4aa,9a,9aa)-(-)-; Microphyllone