Justidrusamides A-D (1-4), four new alkaloids containing 2-aminobenzyl alcohol, succinic acid, and 2,3-dihydroxy-2-(1-hydroxyethyl) butanoic acid skeletons have been isolated from leaves of Justicia gendarussa, and their structures were elucidated using 2D NMR data and chemical means. This is the first report of a 2,3-dihydroxy-2-(1-hydroxyethyl) butanoic acid derivative in nature.

Five new diterpenoids belonging to labdane and isopimarane skeletons, mumic acids A–E (1–5), have been isolated from mumiyo. Their structures and absolute configurations were elucidated on the basis of spectroscopic data and chemical derivatization.