Methanesulfonic acid (1S,3S,3aR,4R,4aS,8aR,9aS)-1-methoxy-3-methyl-dodecahydro-naphtho[2,3-c]furan-4-ylmethyl ester

(1S,3S,3aS,4R,4aS,8aR,9aS)-3-methyldodecahydronaphtho[2,3-c]furan-1,4-diol