(1S,4R,5R,8R,12R,13S)-9-{[(1S,4R,5R,8R,12R,13S)-1,5-dimethyl -10-(trifluoromethyl)-11,14,15,16-tetraoxatetracyclo[10.3.1. 04,13.08,13]hexadec-9-en-9-yl]methoxy}-2-butenyl)oxy]methyl} -1,5-dimethyl-10-trifluoromethyl)-11,14,15,16-tetraoxatetrac yclo[10.3.1.04,13.08,13]hexadec-9-ene NSC724781