Two New Alkaloids from Xestospongia sp., a New Caledonian Sponge

Two New Alkaloids from Xestospongia sp., a New Caledonian Sponge Two New Alkaloids from Xestospongia sp., a New Caledonian Sponge 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 3β,3′β-Dimethylxestospongin C, a NewBis-1-Oxaquinolizidine Alkaloid from the Palauan SpongeXestospongiasp Four new β-carboline alkaloids isolated from two Okinawan marine sponges of Xestospongia sp. and Haliclona sp.) 9′-Epi-3β,3′β-dimethylxestospongin C, a New Macrocyclic Diamine Alkaloid from the Hainan SpongeNeopetrosia exigua Ingamines A and B, new cytotoxic alkaloids from the marine sponge Xestospongia ingens 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> Xestamines A, B, and C, Three New Long-Chain Methoxylamine Pyridines from the Sponge Xestospongia wiedenmayeri