Investigation of the fruit of Zanthoxylum integrifoliolium led to the isolation of three new isobutylamides, lanyuamide I-III and six known isobutylamides, tetrahydrobungeanool, gamma-sanshool hydroxy gamma-sanshool mixture of (2E,4E,8Z,11E)- and (2E,4E,8Z,11Z)-2'-hydroxy-N-isobutyl-2,4,8,11,-tetradecatetraenamide and hazaleamide which was mixed with lanyuamide III. These amides were all with a (2E,4E)-dienamide moiety and their structures were elucidated on the basis of spectral analyses. (C) 1999 Elsevier Science Ltd. All rights reserved.