Using CCCOc1ccc(CCc2ccc3cc(C(C)NC(=O)CC(=O)OCC)oc3c2)cc1 to produce CCCOc1ccc(CCc2ccc3cc(C(C)NC(=O)CC(=O)O)oc3c2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.