A New Isocyanosesquiterpene from the Nudibranch Phyllidiella pustulosa.

In the course of our study on the chemical and genetic diversity of the nudibranch Phylidiella pustulosa, we identified a series of isocyanosesquiterpenes. In addition to known sesquiterpenes, we isolated a new molecule 1, the structure of which was elucidated by analyzing NMR and other spectral data. We report the structure and cytotoxicity of compound 1 herein.