An Acetylenic Alkaloid from the Calcareous Sponge Leucetta sp.

An Acetylenic Alkaloid from the Calcareous Sponge Leucetta sp. (-)-Calcaridine B, a new chiral aminoimidazole-containing alkaloid from the marine sponge Leucetta chagosensis New and Biologically Active Imidazole Alkaloids from Two Sponges of the Genus <i>Leucetta</i> New and Biologically Active Imidazole Alkaloids from Two Sponges of the Genus <i>Leucetta</i> New Acetylenic Acids from a Sponge of the Genus <i>Stelletta</i> Naamines and naamidines, novel imidazole alkaloids from the calcareous sponge leucetta chagosensis Uniquely Modified Imidazole Alkaloids from a Calcareous <i>Leucetta </i>Sponge Two new alkaloids from marine spongeCallyspongiasp. Uniquely Modified Imidazole Alkaloids from a Calcareous Leucetta Sponge New Imidazole Alkaloids from the Sponge <i>Leucetta chagosensis</i>