Using COC(=O)c1cn2nc(C(F)(F)c3nnc4ccc(Br)cn34)ccc2n1 to produce O=C(O)c1cn2nc(C(F)(F)c3nnc4ccc(Br)cn34)ccc2n1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.