Synonyms: 1,6-Dioxa-2-azaspiro[4.6]undeca-2,7,9-triene-3-carboxamide,8,10-dibromo-N-[3-[2,6-dibromo-4-[2-[[(2,5-dioxo-3-cyclopenten-1-ylidene)methyl]amino]ethyl]phenoxy]propyl]-4-hydroxy-9-methoxy-,trans-(-)-; (-)-Psammaplysin E; Psammaplysin E; Psammaplysine E