Andibenin C

3aβ,4-Dihydroandibenin

(3aS,8R,9S,11bR)-3a,4,6a,7,7aα,8,10,11-Octahydro-8-hydroxy-2',2',5,6aβ,8-pentamethylspiro[5α,11aα-methano-11aH-fluoreno[4,4a-c]furan-9(3H),3'(6'H)-[2H]pyran]-3,6,6'-trione