9′-Epi-3β,3′β-dimethylxestospongin C, a New Macrocyclic Diamine Alkaloid from the Hainan SpongeNeopetrosia exigua

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> 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 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 Uncommon Bis‐quinolizidine Alkaloids from the Hainan Sponge Neopetrosia chaliniformis Two New Alkaloids from Xestospongia sp., a New Caledonian Sponge Two New Alkaloids from Xestospongia sp., a New Caledonian Sponge Bis-1-oxaquinolizidines from the Sponge Haliclona exigua Neopetrocyclamines A and B, Polycyclic Diamine Alkaloids from the Sponge <i>Neopetrosia</i> cf <i>exigua</i>