乙酸酐 、
(9S,10R)-3,5,19-trimethoxy-9,10-dimethyl-15,17-dioxatetracyclo[10.7.0.02,7.014,18]nonadeca-1(19),2,4,6,12,14(18)-hexaene-4,9,10-triol 在
吡啶 作用下,
以15 mg的产率得到[(9S,10R)-9,10-dihydroxy-3,5,19-trimethoxy-9,10-dimethyl-15,17-dioxatetracyclo[10.7.0.02,7.014,18]nonadeca-1(19),2,4,6,12,14(18)-hexaen-4-yl] acetate