Using CCOC(=O)C1CCN(Cc2coc3cc(Oc4nc5ncccc5s4)ccc23)CC1 to produce O=C(O)C1CCN(Cc2coc3cc(Oc4nc5ncccc5s4)ccc23)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.