8V2 8v2 methyl (3~{S},7~{R},10~{R},13~{R})-4-[(3~{S},6~{R},8~{a}~{S})-1'-[(2~{S})-2-acetamido-3-(2-chlorophenyl)propanoyl]-5-oxidanylid ene-spiro[1,2,3,8~{a}-tetrahydroindolizine-6,2'-pyrrolidine]-3-yl]carbonyl-2-oxidanylidene-1,4-diazatricyclo[8.3.0.0^{3, 7}]tridec-8-ene-13-carboxylate 8V2