Author's Organization：School of Medicine, Kinki University Faculty of Science, Osaka City University Faculty of Science, Osaka City University School of Medicine, Kinki University Faculty of Science, Osaka City University
In the survey of the minor diterpenoid constituents of Portulaca grandiflora Hook, four new compounds, portulic lactone (4), 3-hydroxyportulol ether (5), 5-hydroxyportulal (6), and 5-hydroxyportulic acid (7), were isolated and their structures, all of which have skeletons related to portulal (1), were elucidated on the basis of spectral evidence and chemical correlations.
