Using COB(OC)OC, Brc1ccc2c(c1)c1ccccc1n2-c1cccc2c1sc1ccccc12 to produce OB(O)c1ccc2c(c1)c1ccccc1n2-c1cccc2c1sc1ccccc12, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.