(2S,3R,4aS,5aR,10aS,11aR)-3,8-Dimethoxy-2-methoxymethyl-7,11a-dimethyl-9-propyl-2,3,4,4a,5a,6,7,10a,11,11a-decahydro-1,5,10-trioxa-cyclohepta[b]naphthalene 以75%的产率得到(2S,3R,4aS,5aR,7S,9R,10aS,11aR)-3-Methoxy-2-methoxymethyl-7,11a-dimethyl-9-propyl-decahydro-1,5,10-trioxa-cyclohepta[b]naphthalen-8-one