Using CCCON(C(=N)N(NC(=O)OCc1ccccc1)C(=O)OC(C)(C)C)C(=O)OC(C)(C)C to produce CCCON(C(=N)N(N)C(=O)OC(C)(C)C)C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.