Using CCOC(=O)C(=O)CBr, Nc1ccc(Cn2nnc3ccc(Br)cc32)nn1 to produce CCOC(=O)c1cn2nc(Cn3nnc4ccc(Br)cc43)ccc2n1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.