methyl N-[(10R,14S)-14-[(6R)-6-(3-chloro-2,6-difluorophenyl)-2-oxo-1,3-oxazinan-3-yl]-10-methyl-9-oxo-8,16,18-triazatricyclo[13.2.1.02,7]octadeca-1(17),2,4,6,15(18)-pentaen-5-yl]carbamate