ethyl [2R,2(1R,2S),3S,4R]-5-benzyloxy-2-[3-benzyloxy-1,2-(diethylmethylenedioxy)propyl]-3,4-(dimethylmethylenedioxy)-2-hydroxy-3-(methylthio)carbonylpentanoate

ethyl (3R,4S,8R)-8-(benzyloxymethyl)-6,6-dimethyl-1-oxo-3-(3-phenylpropyl)-2,5,7-trioxaspiro[3.4]octane-3-carboxylate

ethyl (3S,4S,8R)-8-(benzyloxymethyl)-6,6-dimethyl-1-oxo-3-(3-phenylpropyl)-2,5,7-trioxaspiro[3.4]octane-3-carboxylate

ethyl (2R,3S,4R)-5-benzyloxy-3,4-(dimethylmethylenedioxy)-2-hydroxy-3-methoxycarbonyl-2-(3-phenylpropyl)pentanoate

ethyl (2S,3S,4R)-5-benzyloxy-3,4-(dimethylmethylenedioxy)-2-hydroxy-3-methoxycarbonyl-2-(3-phenylpropyl)pentanoate