Sinularin

flexibilide

(1R,4S,6S,9E,13S,14R)-13-Hydroxy-4,9,13-trimethyl-17-methylene-5,15-dioxatricyclo[12.3.1.04,6]octadec-9-en-16-one

(1R,4S,6S,9E,13S,14R)-13-Hydroxy-4,9,13-trimethyl-17-methylene-5,15-dioxatricyclo[12.3.1.04,6]octadecane-9-ene-16-one