From Siphocampylus verticillatus, two novel piperidine alkaloids have been isolated, namely meso-8,10-di-n-propyllobelidiol[meso-2,6-bis(2'-hydroxypentyl)-N-methylpiperidine] and 8-ethyl-10-n-propyllobelidiol [6-(2'-hydroxybutyl-2-(2-hydroxypentyl)-N-methylpiperidine]. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.