The GSL composition of the marine sponge Agelas dispar was investigate
d. In addition to four GSLs previously isolated from Agelas clathrodes
(2 and 4), Agelas conifera (3), and Agelas longissima (5), the novel
triglycosylceramide 1a was isolated as a major component of the GSL mi
xture. All the isolated GSLs were tested using the MLR assay, and only
some of them were shown to be immunoactivating agents, suggesting a p
ossible structure-activity relationship.