Using Cc1cccc(C)c1Cn1cc(C)c2ccc(C(=O)O)cc21 to produce Cc1cccc(C)c1Cn1cc(C)c2ccc(C(=O)[O-])cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.