Using O=C([O-])[O-], Cn1c(N(C(=O)OC(C)(C)C)c2ccccc2)nc2cc(Nc3ccnc(Cl)n3)ccc21 to produce CN(c1ccc2c(c1)nc(N(C(=O)OC(C)(C)C)c1ccccc1)n2C)c1ccnc(Cl)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.