4,10-dihydroxy-5-hydroxymethyl-1-methoxy-8-methyl-3,7-dioxo-1,3-dihydro-7H-benzo[5,6][1,4]dioxepino[3,2-e]isobenzofuran-11-carbaldehyde 在
palladium on activated charcoal 、
溶剂黄146 作用下,
生成 6-formyl-3,8-dihydroxy-1,4,9-trimethyl-11-oxo-11
H-dibenzo[
b,e][1,4]dioxepin-7-carboxylic acid methyl ester