Using CCCC1C(=O)Oc2ccccc21, O=C(CBr)OCc1ccccc1 to produce CCCC1(CC(=O)OCc2ccccc2)C(=O)Oc2ccccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.