X. Fu et al., MAKALUVIC ACID-A AND ACID-B - NOVEL ALKALOIDS FROM THE MARINE SPONGE ZYZZYA-FULIGINOSUS, Journal of natural products, 59(11), 1996, pp. 1104-1106
Two new substituted pyrrolecarboxylic acids, makaluvic acids A (5) and
B (6), were isolated from the sponge Zyzzya fuliginosus, which was co
llected in Chuuk Atoll, Federated States of Micronesia. The known alka
loids 3,7-dimethylisoguanine (1) and makaluvamines A (2), E (3), and K
(4) were also isolated.