Using CCCN(c1ccccc1)[C@@H](CC(C)C)C(=O)NN=CCCNC(=O)OC(C)(C)C to produce CCCN(c1ccccc1)[C@@H](CC(C)C)C(=O)NNCCCNC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.