Keramamine-A and -B, novel antimicrobial alkaloids from the Okinawan marine sponge sp.

Keramamine-A and -B, novel antimicrobial alkaloids from the Okinawan marine sponge sp. Keramaphidin C and keramamine C plausible biogenetic precursors of manzamine C from an Okinawan marine sponge Keramaphidin B, a novel pentacyclic alkaloid from a marine sponge Amphimedon sp. : A plausible biogenetic precursor of manzamine alkaloids 6-Hydroxymanzamine A and 3,4-Dihydromanzamine A, New Alkaloids from the Okinawan Marine Sponge Amphimedon sp. 6-Hydroxymanzamine A and 3,4-Dihydromanzamine A, New Alkaloids from the Okinawan Marine Sponge Amphimedon sp. Keramadine, a novel antagonist of serotonergic receptors isolated from the okinawan sea sponge sp. Zamamidines A and B, New Manzamine Alkaloids from the Sponge Amphimedon Species Keramamides M and N, two new cyclic peptides with a sulfate ester from Theonella sponge Ceratamines A and B, Antimitotic Heterocyclic Alkaloids Isolated from the Marine Sponge Pseudoceratina sp. Collected in Papua New Guinea Four new β-carboline alkaloids isolated from two Okinawan marine sponges of Xestospongia sp. and Haliclona sp.)