(4aR)-4a,5,6,7,8,8a,9,9aβ-Octahydro-8aβ-hydroxy-3,4aβ,5β-trimethyl-6β-[(Z)-2-methyl-2-butenoyloxy]-9aα-methoxynaphtho[2,3-b]furan-2(4H)-one | (4aR)-4a,5,6,7,8,8a,9,9aβ-Octahydro-8aβ-hydroxy-3,4aβ,5β-trimethyl-6β-[(Z)-2-methyl-2-butenoyloxy]-9aα-methoxynaphtho[2,3-b]furan-2(4H)-one | |