Using Cn1cc(Br)c2ncnc(Cl)c21, CC(C)(C)OC(=O)N1CCC(O)CC1 to produce Cn1cc(Br)c2ncnc(OC3CCN(C(=O)OC(C)(C)C)CC3)c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.