Using C=CC(=O)OC(C)(C)C, COC(=O)c1cc2[nH]cnc2c(F)c1Nc1ccc(Br)cc1Cl to produce COC(=O)c1cc2c(ncn2CCC(=O)OC(C)(C)C)c(F)c1Nc1ccc(Br)cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.