Showing structure for (4z)-4-[(3e,5e,7e,9e,11e,13e,15e)-18-[(4r)-4-hydroxy-2,6,6-trimethylcyclohex-1-en-1-yl]-3,7,12,16-tetramethyl-2-oxooctadeca-3,5,7,9,11,13,15-heptaen-17-yn-1-ylidene]-3,5,5-trimethylcyclohex-2-en-1-one