16-Hydroxy-11,11,15-trimethyl-6,10,19-trioxapentacyclo(13.3.1.02,7.09,18.012,17)nonadeca-1,3,7,9(18)-tetraen-5-one
16-hydroxy-11,11,15-trimethyl-6,10,19-trioxapentacyclo(13.3.1.02,7.09,18.012,17)nonadeca-1,3,7,9(18)-tetraen-5-one