Xeniaoxolane: A New Xenicane-type Diterpenoid from the Okinawan Soft Coral, Xenia sp.; Absolute Configurations of Xeniaoxolane, Xeniolide-A and Xenialactol

A new xenicane-type diterpenoid, xeniaoxolane, containing tetrahydrofuran, was isolated from the Okinawan soft coral of the genus, Xenia along with xeniolide-A and xenialactol. The relative configuration of xeniaoxolane was determined based on spectroscopic analysis. The absolute configuration of xeniolide-A was determined using the modified Mosherʹs method and those of xeniaoxolane and xenialactol, by chemical conversions.