Aragupetrosine a, a new vasodilative macrocyclic quinolizidine alkaloid from an Okinawan marine sponge sp

Aragupetrosine a, a new vasodilative macrocyclic quinolizidine alkaloid from an Okinawan marine sponge sp Araguspongines B, C, D, E, F, G, H, and J, new vasodilative bis-1-oxaquinolizidine alkaloids from an Okinawan marine sponge, Xestospongia sp. Araguspongines B, C, D, E, F, G, H, and J, new vasodilative bis-1-oxaquinolizidine alkaloids from an Okinawan marine sponge, Xestospongia sp. A novel type of bis-quinolizidine alkaloid from the sponge Macrocyclic bis-quinolizidine alkaloids from Xestospongia muta A New Quinolizidine Alkaloid from the Papua New Guinean Sponge Xestospongia exigua A New Quinolizidine Alkaloid from the Papua New Guinean Sponge <i>Xestospongia exigua</i> Araguspongines K and L, New Bioactive Bis-1-oxaquinolizidine N-Oxide Alkaloids from Red Sea Specimens of Xestospongia exigua Araguspongines K and L, New Bioactive Bis-1-oxaquinolizidine <i>N</i>-Oxide Alkaloids from Red Sea Specimens of <i>Xestospongia </i><i>e</i><i>xigua</i> Bis-1-oxaquinolizidines from the Sponge Haliclona exigua