Using COCC1CN(c2ccc3nc(C4CCC(=O)O4)sc3c2)C(=O)O1 to produce COCC1CN(c2ccc3nc(C(O)CCCO)sc3c2)C(=O)O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.