macaranin A 生成 (3S,4S)-4-[(2S)-3-carboxy-1-[[(1S,19R,21S,22R,23R)-8-(6-carboxy-2,3,4-trihydroxyphenoxy)-6,7,11,12,13,22-hexahydroxy-3,16-dioxo-21-(3,4,5-trihydroxybenzoyl)oxy-2,17,20-trioxatetracyclo[17.3.1.04,9.010,15]tricosa-4,6,8,10,12,14-hexaen-23-yl]oxy]-1-oxopropan-2-yl]-5,6,7-trihydroxy-1-oxo-3,4-dihydroisochromene-3-carboxylic acid