mallotinin 生成 [(1S,19R,21S,22R,23R)-23-hydroxy-6,7,8,11,12,13-hexamethoxy-3,16-dioxo-21-(3,4,5-trimethoxybenzoyl)oxy-2,17,20-trioxatetracyclo[17.3.1.04,9.010,15]tricosa-4,6,8,10,12,14-hexaen-22-yl] 3,4,5-trimethoxy-2-[1-(2-methoxy-2-oxoethyl)-3,6-dioxo-2,5-dioxabicyclo[2.2.1]heptan-7-yl]benzoate