自认是高手的进？ 楼主的求助题目＂自认是高手的进＂，我认为这样说不太好啊！我回答了你的问题，那我就是 自认 是高手了！ 再给你一篇文献： [studies on liposoluble constituents from the aerial parts of siegesbeckia orientalis l.] yao xue xue bao. 1997 apr;32(4):282-5. [article in chinese] guo da, zhang zg, ye gq, lou zc. school of pharmaceutical sciences, beijing medical university, beijing 100083. eight compounds were isolated from the aerial parts of siegesbeckia orientalis l. and their structures were elucidated by spectroscopic methods(ir, ei-ms, 13c-nmr, 1h-nmr, 1h-1h cosy, 1h-1h noesy and 1h-13c cosy). compounds i and ii are new natural products and named siegesesteric acid(i) and siegesetheric acid(ii), their structures were confirmed as ent-17-acetoxy-18-isobutyryloxy-16(alpha)-kauran-19-oic acid(i) and ent-17-ethoxy-16(alpha)-(-)-kauran-19-oic acid(ii). the others were identified as known compounds: ent-16 beta, 17-dihydroxy-kauran-19-oic acid (iii), kirenol(iv), beta-sitosteryl glucoside(v), heneicosanol(vi), methyl arachidate(vii) and beta-sitosterol(viii). these compounds, except kirenol and beta-sitosterol, were isolated for the first time from the title plant. 查看更多
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