Using COc1cc2nccc(C(O)c3ccc4cc(Br)ccc4c3)c2cc1OC to produce COc1cc2nccc(Cc3ccc4cc(Br)ccc4c3)c2cc1OC, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.