A New 1,2-Dihydroisoquinoline from the Sponge Petrosia similis

A New 1,2-Dihydroisoquinoline from the Sponge <i>Petrosia</i> <i>similis</i> A New 1,2-Dihydroisoquinoline from the Sponge <i>Petrosia</i> <i>similis</i> Petrosin‐A and ‐B, Two New Bis‐Quinolizidine Alkaloids from the Sponge <i>Petrosia Seriata</i>⁽¹⁾ Petrosin‐A and ‐B, Two New Bis‐Quinolizidine Alkaloids from the Sponge Petrosia Seriata⁽¹⁾ A novel type of bis-quinolizidine alkaloid from the sponge Anti-HIV Active Petrosins from the Marine Sponge Petrosia similis1) 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> Uncommon Bis‐quinolizidine Alkaloids from the Hainan Sponge Neopetrosia chaliniformis A New Quinolizidine Alkaloid from the Papua New Guinean Sponge <i>Xestospongia exigua</i>