Try searching for...
SCFBio, IIT Delhi
Formula: C18H22O5 | Mol. Weight: 318.40 g/mol
IUPAC: (1S,2R,5S,9S,10R,11R,12R,15R)-11-hydroxy-2,6,9,15-tetramethyl-13-oxatetracyclo[10.2.1.02,10.05,9]pentadec-6-ene-3,8,14-trione
CC1C2C(C3C4(C(CC(=O)C3(C1C(=O)O2)C)C(=CC4=O)C)C)O