Using COCC(=O)Cl, Nc1c[nH]c2ncc(C(F)(F)F)c(Cl)c12 to produce COCC(=O)Nc1c[nH]c2ncc(C(F)(F)F)c(Cl)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.