Ingenamine, a novel pentacyclic alkaloid from the marine sponge Xestospongia ingens

Ingenamine, a novel pentacyclic alkaloid from the marine sponge Xestospongia ingens Ingamines A and B, new cytotoxic alkaloids from the marine sponge Xestospongia ingens Ingenamine alkaloids isolated from the sponge Xestospongia ingens: Structures and absolute configurations Madangamines B−E, Pentacyclic Alkaloids from the Marine Sponge Xestospongia ingens Ingenines A and B, Two New Alkaloids from the Indonesian Sponge Acanthostrongylophora ingens Ingenamine G and Cyclostellettamines G−I, K, and L from the New Brazilian Species of Marine Sponge<i>Pachychalina</i>sp. Ingenamine G and Cyclostellettamines G−I, K, and L from the New Brazilian Species of Marine Sponge<i>Pachychalina</i>sp. Ingenine E, a new cytotoxic β-carboline alkaloid from the Indonesian sponge Acanthostrongylophora ingens Ingenines C and D, new cytotoxic pyrimidine- β -carboline alkaloids from the Indonesian sponge Acanthostrongylophora ingens A New Quinolizidine Alkaloid from the Papua New Guinean Sponge <i>Xestospongia exigua</i>