isopropyl 3-{2-chloro-4-fluoro-5-[5,6,8,8a-tetrahydro-1,3-dioxo-1H-imidazo[5,1-c][1,4]-thiazin-2(3H)-yl]phenyl}tetrahydro-5-methyl-2,4,6-trioxo-s-triazine-1(2H)-acetate