8T5 8t5 (1~{S},4~{S},7~{R},10~{R})-14-[(3~{S},6~{R},8~{a}~{S})-1'-[(2~{S})-2-acetamido-3-(2-chlorophenyl)propanoyl]-5-oxidanylidene-spiro[1,2,3,8~{a}-tetrahydroindolizine-6,2'-pyrrolidine]-3-yl]carbonyl-2-oxidanylidene-3,14-diazatricyclo[8.4.0.0^{3,7}]tetradec-8-ene-4-carboxylic acid 8T5