A new carbazole alkaloid, siamenol (1), and two known alkaloids, mahanimbine (2) and mahanimbilol (3), have been isolated from the organic extract of Murraya siamensis. The novel compound exhibited HIV-inhibitory activity.

Four new indoles, ancorinolates A-C and bis-ancorinolate B, which contain sulfamate and sulfate groups, were isolated from the aqueous extract of the sponge Ancorina sp. In addition, ancorinazole, an indolo[3,2-a]carbazole also possessing sulfamate and sulfate groups, was isolated from two separate New Zealand collections of Ancorina sp. Ancorinazole is the first indolo[3,2-a]carbazole described as a natural product. Ancorinolates A (1) and C (3) showed weak HIV-inhibitory activity in the XTT-based, anticytopathicity assay.

Three new isomalabaricane triterpenes, 29-hydroxystelliferin E (1), 29-hydroxystelliferin A (2), and stelliferin G (3), together with the known triterpene 3-epi-29-hydroxystelliferin E (4), were isolated from the organic extract of the sponge Jaspis sp. collected in the South Pacific. All the compounds isolated showed antiproliferative activity against melanoma cells (MALME-3M).