3,13,16-Trioxatetracyclo(10.2.1.17,10.02,4)hexadeca-1(15),7,9-triene-8-carboxylic acid, 5,11-bis(1-methylethenyl)-14-oxo-, methyl ester, (2S-(2R*,4S*,5S*,11S*,12S*))- 83560-98-9 Pseudopterolide