Showing structure for 1-[2,3-dimethyl-5-(2-oxopropyl)oxolan-2-yl]-18-(4-hydroxy-2,6,6-trimethylcyclohex-1-en-1-yl)-3,7,12,16-tetramethyloctadeca-3,5,7,9,11,13,15-heptaen-17-yn-2-one