Madangamines B−E, Pentacyclic Alkaloids from the Marine Sponge Xestospongia ingens

Madangamines B−E, Pentacyclic Alkaloids from the Marine Sponge Xestospongia ingens Ingamines A and B, new cytotoxic alkaloids from the marine sponge Xestospongia ingens Ingenamine, a novel pentacyclic alkaloid from the marine sponge Xestospongia ingens Ingenamine alkaloids isolated from the sponge Xestospongia ingens: Structures and absolute configurations Two New Alkaloids from Xestospongia sp., a New Caledonian Sponge Two New Alkaloids from Xestospongia sp., a New Caledonian Sponge Zamamiphidins B and C, Manzamine-Related Alkaloids from an Amphimedon sp. Marine Sponge Collected in Okinawa The Alkaloids of the Madangamine Group A New Quinolizidine Alkaloid from the Papua New Guinean Sponge <i>Xestospongia exigua</i> Ceratamines A and B, Antimitotic Heterocyclic Alkaloids Isolated from the Marine Sponge Pseudoceratina sp. Collected in Papua New Guinea