(1S,4R,5R,12R,13S)-9-[(2-{[(1S,4R,5R,8R,12R,13S)-1,5-dimethy l)-11,14,15,16-tetraoxatetracyclo[10.3.1.04,13.08,13]hexadec -9-en-9-yl]methoxy}ethoxy)methyl]-1,5-dimethyl-10-(trifluoro methyl)-11,14,15,16-tetraoxatetracyclo[10.3.1.04,13.08,13]he xadec-9-ene NSC724780