Using CON(C)C(=O)c1cc2nc(N3CCCC3)cc(N(C(=O)OC(C)(C)C)C3CCOCC3)n2n1, CC[Mg]Br to produce CCC(=O)c1cc2nc(N3CCCC3)cc(N(C(=O)OC(C)(C)C)C3CCOCC3)n2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.