Using Cc1nc(C(=O)N2CCOC3(CCN(CCOc4cccc(CCO)c4)CC3)C2)cs1 to produce Cc1nc(C(=O)N2CCOC3(CCN(CCOc4cccc(CC=O)c4)CC3)C2)cs1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.