Using CCc1cc(-c2cc(C(=O)OC)c(C)cc2C2CCC2)n[nH]1 to produce CCc1cc(-c2cc(C(=O)O)c(C)cc2C2CCC2)n[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.