5,15-Dioxatricyclo(12.3.1.0(4,6))octadec-9-en-16-one, 13-hydroxy-4,9,13,17-tetramethyl-, (1R-(1R*,4S*,6S*,9E,13S*,14R*,17S*))- 65669-71-8 Dihydrosinularin