A phytochemical study on the MeOH extract of Lespedeza tomentosa roots led to the discovery of two new pterocarpans (labelled tomentocarpan A and B), along with three known pterocarpans and a flavanone. The structures of the two new compounds were found to be (6aR,11aR)-1-methoxy-8-hydroxy-2′,2′-dimethylpyrano[5′,6′:2,3]-2′′,2′′-dimethylpyrano[6′′,5′′:9,10]pterocarpan (5), and 1-methoxy-8-hydroxy-2′,2′-dimethylpyrano[5′,6′:2,3]-2′′,2′′-dimethylpyrano[6′′,5′′:9,10]pterocarp-6a(11a)-ene (6), based on comprehensive spectral and physical property analyses. Compounds 5 and 6 showed butyrylcholinesterase inhibitory activities with IC₅₀ values of 0.50 and 0.62 mM, respectively.

对Lespedeza tomentosa根的MeOH提取物进行的植物化学研究导致发现了两个新的罗汉松（标记为tomentocarpan A和B），以及三个已知的罗汉松和黄烷酮。发现这两种新化合物的结构为（6aR，11aR）-1-甲氧基-8-羟基-2'，2'-二甲基吡喃并[5'，6'：2,3] -2''，2' ′-二甲基吡喃并[6′，5′′：9，10] carp果烷（5）和1-甲氧基-8-羟基-2′，2′-二甲基吡喃并[5′，6′：2，3] -2基于综合的光谱和物理性质分析，′′，2′′-二甲基吡喃并[6′′，5′′：9，10] pt果-6a（11a）-烯（6）。化合物5和6表现出丁酰胆碱酯酶抑制活性，IC ₅₀值分别为0.50和0.62 mM。