Using COB(OC)OC, Brc1cccc2c3cccc4c3n(c12)-c1ccccc1C4(c1ccccc1)c1ccccc1 to produce OB(O)c1cc2c3c(c1)c1ccccc1n3-c1ccccc1C2(c1ccccc1)c1ccccc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.