corresponding 5β,6β- and 5α,6α-epoxides, respectively, by acid treatment in ethanol. The 5α-ethoxy derivative was isolated as an artefact from Physalis alkekengi, while other workers isolated the 6β-ethoxy compound as a constituent of P. minima and mistakenly named it as physalin L, which had already been assigned to (25S)-3,4-didehydro02,3,25,27- tetrahydrophysalin A. The 1H NMR spectrum of the 6β-ethoxy
5α-Ethoxy-6β-hydroxy- 和 6β-ethoxy-5α-hydroxy-5,6-dihydrophysalin B 分别来自相应的 5β,6β- 和 5α,6α-环氧化物,通过在乙醇中进行酸处理。5α-乙氧基衍生物是从 Physalis alkekengi 中作为人工制品分离出来的,而其他工作人员则将 6β-乙氧基化合物作为 P. minima 的成分分离出来,并错误地将其命名为 physalin L,该化合物已被分配到 (25S)-3, 4-didehydroO2,3,25,27-tetrahydrophysalin A。然而,我们制备的6β-乙氧基衍生物的1H NMR 谱与报道的数据不一致。