(1S,3R,7S,8S,11S,12S,15R,16R)-15-[(2R,5S)-5,6-DimethylHept-6-en-2-yl]-7,12,16-TrimethylPentacyclo[9.7.0.0{1,3}.0{3,8}.0{12,16}]Octadecan-6-One