An investigation of the roots of Convolvulus siculus and C. sabatius ssp. mauritanicus afforded two new tropan-3 alpha-ol esters named consiculine and consabatine and the known base merresectine B (3). The acyl residues of the new alkaloids are formed by consiculic acid ( = 1 beta,2 alpha-dihydroxy-5-prenyl-cyclohex-5-en-4-one carboxylic acid) and its 2-deoxy derivative, respectively. (C) 1998 Elsevier Science Ltd. All rights reserved.