Suberosols A-D, four new sesquiterpenes with β-caryophyllene skeletons from a Taiwanese gorgonian coral Subergorgia suberosa

Four new β-caryophyllene-derived sesquiterpenes alcohols, suberosols A (1), B (2), C (3), and D (4), along with two known β-caryophyllene-derived sesqueterpene ketones, buddledins C (5) and D (6), were isolated from a Taiwanese gorgonian coral Subergorgia suberosa. The structures of 1-4 were determined on the basis of extensive spectroscopic analyses. Cytotoxicity of these compounds toward various cancer cell lines is also described.