Using CCN1C(=O)C(C)(C)C(=O)N(C)c2cc(OCCCN3C(=O)c4ccccc4C3=O)ccc21 to produce CCN1C(=O)C(C)(C)C(=O)N(C)c2cc(OCCCN)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.