Using CCOB(OCC)OCC, Brc1c2ccccc2c(-c2ccccc2)c2ccccc12 to produce OB(O)c1c2ccccc2c(-c2ccccc2)c2ccccc12, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.