Using C[O-], BrCCC1CCc2c(sc3ncnc(Nc4cccc(Br)c4)c23)C1 to produce COCCC1CCc2c(sc3ncnc(Nc4cccc(Br)c4)c23)C1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.