8-[2-[methyl-[2-(7,9,9-trioxo-9$l^{6}-thia-8-azabicyclo[4.3.0]nona-1,3 ,5-trien-8-yl)ethyl]amino]ethyl]-9,9-dioxo-9$l^{6}-thia-8-azabicyclo[4 .3.0]nona-1,3,5-trien-7-one