N-Isobutylamides and Butyrolactone from the Fruits ofZanthoxylum integrifoliolum

Further investigations of the CHCl3-soluble fraction of the fruit of Zanthoxylum integrifoliolum led to the 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.