Using COCCBr, NC(=O)c1cn(CC(=O)N2C[C@H](F)C[C@H]2C(=O)NCc2cccc(Cl)c2F)c2cc(O)ccc12 to produce COCCOc1ccc2c(C(N)=O)cn(CC(=O)N3C[C@H](F)C[C@H]3C(=O)NCc3cccc(Cl)c3F)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.