Using O=C1CCC(=O)N1Cl, Nc1c(C(=O)c2ccc(F)cc2)ccc2cccnc12 to produce Nc1c(C(=O)c2ccc(F)cc2)cc(Cl)c2cccnc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.