Using COCCNCc1cccc(Br)c1, CC(C)(C)OC(=O)OC(C)(C)C to produce COCCN(Cc1cccc(Br)c1)C(=O)OC(C)(C)C, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.