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Unsaturated all-cis-5,8,11,14-eicosatetraenoic(arachidonic), 7,10,13-hexadecatrienoic, 10, 13-octadecadienoic acid ethyl ester and a lot of chimyl alcohol were isolated along with common 9-hexadecenoic acid ethyl ester from marine mollusca Bullacta exarata collected from sangnackworl island in the Korea sea. In addition, cholesterol and its fatty acid ester were obtained. Their structures were deduced from 1H-and 13C-NMR, GC-ms, and FT-IR spectra.
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