From the aerial parts of Delphinium carduchorum, we have isolated three known norditerpenoid alkaloids (delcaroline, deltatsine, 18-hydroxy-14-O-methyl-gadesine) and two new diterpenoid alkaloids, carduchoron and delcarduchol. The structures of the newly isolated alkaloids were established from spectroscopic data. (C) 1999 Elsevier Science Ltd. All rights reserved.