Using Cc1cc(C)c(-n2c(C)cc3c2=NC(C)NC=3Cl)c(C)c1, O=C(Cl)CCl to produce Cc1cc(C)c(-n2c(C)c(C(=O)CCl)c3c2=NC(C)NC=3Cl)c(C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.