Microtropins Q–W, (2 S ,3 R )-2-ethyl-2,3-dihydroxybutyrate of various glucosides and glucose, as well as three ent -labdane diterpenoid glucosides, named microtropiosides G, H and I, an ursane-type triterpene diglucoside and a flavonoid glycoside were isolated from the MeOH extract of the leaves of Microtropis japonica . The structure of microtropioside A, also isolated from the branches of M. japonica , was elucidated spectroscopically in a previous experiment and was found to possess a rare seven-membered oxyrane ring. Its structure was confirmed by X-ray crystallographic analysis of its pentaacetate.