(3aS,10Z,14S,16aS)-14-[(2S)-butan-2-yl]-1-(N,N-dimethyl-L-isoleucyl-L-phenylalanyl)-8-methoxy-13,16-dioxo-1,2,3,3a,12,13,14,15,16,16a-decahydro-9,5-(metheno)pyrrolo[3,2-b][1,5,8]oxadiazacyclopentadecine