Using COC(=O)c1ccc2c(-c3cccc(C)c3)cc(=O)oc2c1 to produce Cc1cccc(-c2cc(=O)oc3cc(C(=O)O)ccc23)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.