20-N-Methylpurpuramine E: New Bromotyrosine-Derived Metabolite from Okinawan Marine Sponge Pseudoceratina purpurea

20-<i>N</i>-Methylpurpuramine E: New Bromotyrosine-Derived Metabolite from Okinawan Marine Sponge <i>Pseudoceratina purpurea</i> Purpuramines A-I, new bromotyrosine-derived metabolites from the marine sponge Psammaplysilla purpurea Two New Bromotyrosine-Derived Metabolites from the Sponge Psammaplysilla purpurea Dibromotyrosine Derivatives, a Maleimide, Aplysamine-2 and Other Constituents of the Marine Sponge Pseudoceratina purpurea Purealidin A, a new cytotoxic bromotyrosine-derived alkaloid from the Okinawan marine spongePsammaplysilla purea Three new bromotyrosine derivatives lethal to crab from the marine sponge, Pseudoceratina purpurea Two New Bromotyrosine Derivatives from the Marine Sponge Pseudoceratina sp. A New Dibromotyrosine-Derived Metabolite from the Sponge <i>Psammaplysilla</i> <i>purpurea</i> New Antimicrobial Bromotyrosine Analogues from the Sponge Pseudoceratina purpurea and Its Predator Tylodina corticalis Purealidins E-G, New Bromotyrosine Alkaloids from the Okinawan Marine Sponge Psammaplysilla purea