Further investigations of the CHCl3-double fraction of the fruit of Zanthox
ylum integrifoliolum isolation of three new N-isobutylamides: lanyuamide IV
(1). lanyuamide V (2) and lanyuamide VI (3), along with lanyulactone (4),
a new butyrolactone derivative. The structures of these new. compounds were
elucidated by spectroscopic data.