Try searching for...
SCFBio, IIT Delhi
Formula: C20H26O4 | Mol. Weight: 330.40 g/mol
IUPAC: (1R,8S,10S,13S)-13-hydroxy-11,11-dimethyl-5-propan-2-yl-16-oxatetracyclo[6.6.2.01,10.02,7]hexadeca-2(7),5-diene-3,4-dione
CC(C)C1=CC2=C(C(=O)C1=O)C34CC(CC(C3CC2OC4)(C)C)O