Using COB(OC)OC, Cc1cc2c(nc3c4ccc(C(C)(C)C)nc4cc(C(C)(C)C)n23)c(Br)c1C to produce Cc1cc2c(nc3c4ccc(C(C)(C)C)nc4cc(C(C)(C)C)n23)c(O)c1C, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.