Using O=C1CN=C(c2ccccc2)c2cc(Cl)ccc2N1, COC(=O)CBr to produce COC(=O)CN1C(=O)CN=C(c2ccccc2)c2cc(Cl)ccc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.