X. Fu et al., NEW IMIDAZOLE ALKALOIDS AND ZINC-COMPLEXES FROM THE MICRONESIAN SPONGE LEUCETTA CF. CHAGOSENSIS, Journal of natural products, 61(3), 1998, pp. 384-386
Four new imidazole alkaloids, 2-5, along with the known isonaamidine B
(1) were isolated from a Pacific sponge, Leucetta cf. chagosensis, co
llected from Yap, Federated States of Micronesia. Among these, 4 and 5
are zinc complexes derived from isonaamidine B and isonaamidine D. Th
e structures of the new compounds were elucidated from spectral data.
Isonaamidine D (3) showed weakly antifungal activity against Aspergill
us niger with MIC = 100 mu g/mL.