Ceratinadin G, a new psammaplysin derivative possessing a cyano group from a sponge of the genus .

A new psammaplysin derivative, ceratinadin G (), was obtained from the Okinawan marine sponge sp., and the gross structure was clarified through spectroscopic and spectrometric analyses. The absolute configuration of compound was established by comparing its NMR and ECD data with those of the known psammaplysin derivative, psammaplysin F ().

Ceratinadins E and F, New Bromotyrosine Alkaloids from an Okinawan Marine Sponge sp.

Two new bromotyrosine alkaloids, ceratinadins E () and F (), were isolated from an Okinawan marine sponge sp. as well as a known bromotyrosine alkaloid, psammaplysin F (). The gross structures of and were elucidated on the basis of spectroscopic data.