(3aR,3bR,7aR,8aR)-5-Methoxy-2,2-dimethyl-hexahydro-1,3,8-trioxa-5-phospha-cyclopenta[a]indene 5-oxide

Acetic acid (3R,3aR,7aR)-2-acetoxy-5-methoxy-5-oxo-octahydro-1-oxa-5λ5-phospha-inden-3-yl ester