Using CC(C)(C)OC(=O)N(C(=O)OC(C)(C)C)c1ncc(CBr)cn1, CCOC(=O)CC(=O)OCC to produce CCOC(=O)C(Cc1cnc(N(C(=O)OC(C)(C)C)C(=O)OC(C)(C)C)nc1)C(=O)OCC, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.