Using COCOc1ccc(Cc2c(C)cc(C(=O)OC)cc2C)cc1C(C)C to produce COCOc1ccc(Cc2c(C)cc(C(=O)O)cc2C)cc1C(C)C, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.