Two new steroidal alkaloids 3 alpha-amino-23,29-imino-B(9a)-homo-19-no
r-5 alpha-stigmasta-1(10),7,9(11),23(N)-tetraene (1) and 3 alpha-amino
-23,29-imino-B(9a)-homo-19-nor-5 alpha-stigmasta-1(10),7,23(N)-triene
(2) have been isolated from a Pacific marine sponge Corticium sp. The
structures of compounds 1 and 2 were defined by spectral methods and m
ainly 1D and 2D NMR experiments. (C) 1998 Published by Elsevier Scienc
e Ltd. All rights reserved.