Keramaphidin B, a novel pentacyclic alkaloid from a marine sponge Amphimedon sp. : A plausible biogenetic precursor of manzamine alkaloids

Keramaphidin B, a novel pentacyclic alkaloid from a marine sponge Amphimedon sp. : A plausible biogenetic precursor of manzamine alkaloids Keramaphidin C and keramamine C plausible biogenetic precursors of manzamine C from an Okinawan marine sponge Zamamiphidins B and C, Manzamine-Related Alkaloids from an Amphimedon sp. Marine Sponge Collected in Okinawa Nakadomarin A, a Novel Hexacyclic Manzamine-Related Alkaloid from Amphimedon Sponge Zamamiphidin A, a New Manzamine Related Alkaloid from an Okinawan Marine Sponge Amphimedon sp. A New Manzamine Congener from Marine Sponge Amphimedon sp. Keramamine-A and -B, novel antimicrobial alkaloids from the Okinawan marine sponge sp. Zamamidines A and B, New Manzamine Alkaloids from the Sponge Amphimedon Species Chiral resolution of (±)-keramaphidin B and isolation of manzamine L, a new β-carboline alkaloid from a sponge Amphimedon sp. Nakinadines B–F: new pyridine alkaloids with a β-amino acid moiety from sponge Amphimedon sp.