Ptilomycalin D, a Polycyclic Guanidine Alkaloid from the Marine Sponge Monanchora dianchora

Ptilomycalin D, a Polycyclic Guanidine Alkaloid from the Marine Sponge Monanchora dianchora Ptilomycalin D, a Polycyclic Guanidine Alkaloid from the Marine Sponge <i>Monanchora dianchora</i> Monanchomycalin C, a New Pentacyclic Guanidine Alkaloid from the Far-Eastern Marine Sponge Monanchora Pulchra Alkaloids from the Sponge <i>Monanchora </i><i>u</i><i>nguifera</i> Alkaloids from the Sponge Monanchora unguifera Monanchorin, a Bicyclic Alkaloid from the Sponge <i>Monanchora </i><i>u</i><i>ngiculata</i> Novel Polycyclic Guanidine Alkaloids from Two Marine Sponges of the Genus <i>Monanchora</i> Unguiculin A and Ptilomycalins E–H, Antimalarial Guanidine Alkaloids from the Marine Sponge <i>Monanchora unguiculata</i> Novel Polycyclic Guanidine Alkaloids from Two Marine Sponges of the Genus Monanchora Monanchoxymycalins A and B, New Hybrid Pentacyclic Guanidine Alkaloids from the Far-Eastern Marine Sponge Monanchora pulchra