Using OB(O)c1cccnc1F, CCOC(=O)c1cnn(-c2cccc(Cl)n2)c1C(F)(F)F to produce CCOC(=O)c1cnn(-c2cccc(-c3cccnc3F)n2)c1C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.