Phytochemical constituents in alkaloid extracts from three Thai club mosses Huperzia squarrosa, Huperzia phlegmaria and Phlegmariurus nummularifolius were investigated. Squarrosinoxide was an undescribed Lycopodium alkaloid from H. squarrosa possessing an unprecedented 6/5/7 tricyclic spiro system. Acetyllycophlegmarianol was an undescribed N-oxide lycopodine-type alkaloid isolated from H. phlegmaria. 4-Epilycopodine, an undescribed epimer of lycopodine, was first isolated from P. nummularifolius. The structural assignments were established through comprehensive spectroscopic techniques and chemical correlations. All compounds were assayed for their anti-acetylcholinesterase activity in vitro.

中文翻译：

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来自泰国俱乐部苔藓的三种石松生物碱

研究了三种泰国苔藓 Huperzia squarrosa、Huperzia phlegmaria 和 Phlegmariurus nummularifolius 的生物碱提取物中的植物化学成分。Squarrosinoxide 是一种未描述的石松生物碱，来自 H. squarrosa，拥有前所未有的 6/5/7 三环螺环系统。Acetyllycophlegmarianol 是一种未描述的 N-氧化物 lycopodine 型生物碱，从 H. phlegmaria 中分离出来。4-Epilycopodine 是一种未描述的石松子差向异构体，首先从 P. nummularifolius 中分离出来。结构分配是通过综合光谱技术和化学相关性建立的。体外测定了所有化合物的抗乙酰胆碱酯酶活性。