Using COC(=O)C1CCN(CC(=O)N(CC2=NC3CCOCC3C(=O)N2)CC2CC2)CC1 to produce O=C(O)C1CCN(CC(=O)N(CC2=NC3CCOCC3C(=O)N2)CC2CC2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.