Using COC(=O)C(Br)c1cccc(OC)c1, CC(C)(C)OC(=O)NCCN to produce COC(=O)C(NCCNC(=O)OC(C)(C)C)c1cccc(OC)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.