Using COc1ccccc1C1CCN(C(=O)c2c3n(c4ccccc24)CCN(C(=O)OC(C)(C)C)C3)CC1 to produce COc1ccccc1C1CCN(C(=O)c2c3n(c4ccccc24)CCNC3)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.