Keramaphidin C and keramamine C plausible biogenetic precursors of manzamine C from an Okinawan marine sponge

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 Keramamine-A and -B, novel antimicrobial alkaloids from the Okinawan marine sponge sp. A New Manzamine Congener from Marine Sponge Amphimedon sp. Zamamiphidins B and C, Manzamine-Related Alkaloids from an Amphimedon sp. Marine Sponge Collected in Okinawa Zamamiphidin A, a New Manzamine Related Alkaloid from an Okinawan Marine Sponge Amphimedon sp. Structures and Biogenesis of Manzamines and Related 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. Chiral resolution of (±)-keramaphidin B and isolation of manzamine L, a new β-carboline alkaloid from a sponge Amphimedon sp.