Linear peptide alkaloids from the sponge Clionacelata (Grant). Celenamides C and D

Abstract
Celenamides C (7) and D (8), two novel alkaloids closely related to peptide alkaloids found in higher plants, have been isolated as their penta (12) and nonacetyl (13) derivatives, respectively, from acetylated extracts of the sponge Clionacelata (Grant). The structure elucidation of 7 and 8 is described.