Using Brc1ccnc2c1ccc1c(-c3ccccc3)ccnc12, COB(OC)OC to produce OB(O)c1ccnc2c1ccc1c(-c3ccccc3)ccnc12, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.