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> A New Quinolizidine Alkaloid from the Papua New Guinean Sponge Xestospongia exigua 9′-Epi-3β,3′β-dimethylxestospongin C, a New Macrocyclic Diamine Alkaloid from the Hainan SpongeNeopetrosia exigua 3β,3′β-Dimethylxestospongin C, a NewBis-1-Oxaquinolizidine Alkaloid from the Palauan SpongeXestospongiasp 9′<i>-Epi</i>-3<i>β</i>,3′<i>β</i>-dimethylxestospongin C, a New Macrocyclic Diamine Alkaloid from the Hainan Sponge<i>Neopetrosia exigua</i> Two New Alkaloids from Xestospongia sp., a New Caledonian Sponge Two New Alkaloids from Xestospongia sp., a New Caledonian Sponge Uncommon Bis‐quinolizidine Alkaloids from the Hainan Sponge Neopetrosia chaliniformis Ingamines A and B, new cytotoxic alkaloids from the marine sponge Xestospongia ingens Bis-1-oxaquinolizidines from the Sponge Haliclona exigua