methyl (2R,2'S,3a'S,5''R,6'S,7a'R)-5''-methyl-4''-oxodecahydrodispiro[oxirane-2,3'-benzofuran-2',2''-pyran]-6'-carboxylate

(3aS,6S,7aR)-3-<(benzyloxy)methoxy>hexahydro-6-vinyl-2(3H)-benzofuranone