Compound 15

(3aR,4R,5aR,6R,8aS,8bR)-3a,4-dihydroxy-6,8b-dimethylhexahydro-1H-8a,5a-(epoxyethano)indeno[4,5-c]furan-3,10(3aH)-dione

From: An eight-step gram-scale synthesis of (−)-jiadifenolide