N-{(2S,3S)-1-[(3aS,10Z,14S,16aS)-14-[(2S)-butan-2-yl]-8-methoxy-13,16-dioxo-3,3a,12,13,14,15,16,16a-octahydro-9,5-(metheno)pyrrolo[3,2-b][1,5,8]oxadiazacyclopentadecin-1(2H)-yl]-3-methyl-1-oxopentan-2-yl}-Nalpha,Nalpha-dimethyl-L-phenylalaninamide [298183