Hymenamides G, H, J, and K, four new cyclic octapeptides from the Okinawan marine sponge Hymeniacidon sp.

Hymenamides G, H, J, and K, four new cyclic octapeptides from the Okinawan marine sponge Hymeniacidon sp. Hymenamides C ~ E, new cyclic heptapeptides with two proline residues from the okinawan marine sponge hymeniacidon sp. Hymenamides a and b, new proline-rich cyclic heptapeptides from the okinawan marine sponge hymeniacidon sp. Hymenamide F, new cyclic heptapeptide from marine sponge Hymeniacidon sp Keramamides E, G, H, and J, new cyclic peptides containing an oxazole or a thiazole ring from a Theonella sponge Spongiacidins A−D, New Bromopyrrole Alkaloids from <i>Hymeniacidon</i> Sponge Keramamides M and N, two new cyclic peptides with a sulfate ester from Theonella sponge Hymenin, a novel α-adrenoceptor blocking agent from the Okinawan marine spongeHymeniacidon sp. Zamamiphidins B and C, Manzamine-Related Alkaloids from an Amphimedon sp. Marine Sponge Collected in Okinawa A New Manzamine Congener from Marine Sponge Amphimedon sp.