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报道以家蚕粪叶绿素初提物为原料，经酸、碱降解反应制备叶绿素ａ稳定降解产物脱镁叶绿酸ａ（Ⅰ）、紫红素一１８（Ⅲ）、二氢卟吩Ｐ６－６、γ－二甲酯（Ⅴ）、二氢卟吩ｅ６（Ⅳ）和二氢卟吩ｅ４（Ⅶ）的方法，其中Ⅴ、Ⅶ的ＵＶ、ＩＲ和1ＨＮＭＲ及ＦＡＢＭＳ谱数据系首次报道。
It was reported that the initial extract of chlorophyll of silkworm excrement was used as raw material to prepare chlorophyll a stable degradation product pheophorbide a (I), purpurin 18 (III), dihydroporphine P6-6, γ by acid and alkali degradation reactions. The method of dimethyl ester (V), dihydroporphine e6 (IV) and dihydroporphine e4 (VII), wherein UV, IR and 1H NMR and FABMS spectral data of V and VII were reported for the first time.