A new dimeric isoquinoline alkaloid, jorumycin (3), has been isolated from
the skin and the mucus of the Pacific nudibranch Jorunna funebris. The stru
cture has been fully elucidated on the grounds of ESMS data and of an exten
sive 2D NMR analysis. The cytotoxicity of 3 was evaluated against various h
uman cancer cell lines and was found to be slightly less potent than Et 743
(2). (C) 2000 Elsevier Science Ltd. All rights reserved.