Using COC(=O)c1ccc(Br)c(O)c1, O=C(CBr)N1CCOCC1 to produce COC(=O)c1ccc(Br)c(OCC(=O)N2CCOCC2)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.