Using O=S(=O)(O)O, CCOC(Cc1ccc(OCCN2c3ccccc3Oc3ccccc32)cc1)C(=O)NC(CO)c1ccccc1 to produce CCOC(Cc1ccc(OCCN2c3ccccc3Oc3ccccc32)cc1)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.