Using COc1ccc(Cn2cc(-c3csc(Nc4nccc(C)n4)n3)c(Br)n2)cc1, OB(O)c1ccccc1 to produce COc1ccc(Cn2cc(-c3csc(Nc4nccc(C)n4)n3)c(-c3ccccc3)n2)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.