Using COc1ccc(CCN2CCC(C(=O)c3nc4ccccc4s3)CC2)cc1 to produce COc1ccc(CCN2CCC(C(O)c3nc4ccccc4s3)CC2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.