Two diverse constituents of the cephalaspidean mollusk Smaragdinella calyculata

Two diverse constituents of the cephalaspidean mollusk Smaragdinella calyculata Three new cytotoxic alkaloids, aplaminone, neoaplaminone and neoaplaminone sulfate from the marine mollusc aplysia kurodai Aplaminal:  A Novel Cytotoxic Aminal Isolated from the Sea Hare <i>Aplysia kurodai</i> Calyxamines A and B, Novel Piperidine Alkaloids from the Caribbean Sea Sponge Calyx podatypa Nakinadine A, a novel bis-pyridine alkaloid with a β-amino acid moiety from sponge Amphimedon sp. Arnoamines A and B, New Cytotoxic Pentacyclic Pyridoacridine Alkaloids from the Ascidian <i>Cystodytes</i> sp. Arnoamines A and B, New Cytotoxic Pentacyclic Pyridoacridine Alkaloids from the Ascidian Cystodytes sp. Callyspongamide A, a New Cytotoxic Polyacetylenic Amide from the Red Sea Sponge <i>Callyspongia </i><i>f</i><i>istularis</i> Pyrinodemin A, a cytotoxic pyridine alkaloid with an isoxazolidine moiety from sponge Amphimedon sp Axinellamide, a new alkaloid from the marine sponge Axinella sp.