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. 6-Hydroxymanzamine A and 3,4-Dihydromanzamine A, New Alkaloids from the Okinawan Marine Sponge Amphimedon sp. Zamamidines A and B, New Manzamine Alkaloids from the Sponge Amphimedon Species Ma'eganedin A, a new manzamine alkaloid from Amphimedon sponge Four new β-carboline alkaloids isolated from two Okinawan marine sponges of Xestospongia sp. and Haliclona sp.) A New Manzamine Congener from Marine Sponge Amphimedon sp. Zamamidine D, a Manzamine Alkaloid from an Okinawan <i>Amphimedon</i> sp. Marine Sponge 8-Hydroxymanzamine A, a β-Carboline Alkaloid from a Sponge, Pachypellina 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.