Using O=C1Nc2cc(Cl)cc(Cl)c2C1=O, Brc1ccc2ccccc2c1 to produce O=C1Nc2cc(Cl)cc(Cl)c2C1(O)c1ccc2ccccc2c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.