Using COCCOC1=NC(N)(N)C2=NC=NC2=N1, O=C(CBr)c1ccccc1 to produce COCCOc1nc(N)c2ncn(CC(=O)c3ccccc3)c2n1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.