摘要
Ⅰ. INTRODUCTION Seven alkaloids were isolated from the roots of Zanthoxylum nitidum by HUANG Zhi-xun et al. The compound C<sub>22</sub>H<sub>21</sub>O<sub>5</sub>N, named 6-methoxy-5, 6-dihydrochelerythrine, was one of the alkaloids. It exhibits medium antitumor activity.We carry out the X-ray structural analysis of the drug in order to study the relation between the molecular structure and its antitumor activities.
