Using O=C(O)C1COCCN1c1nc(Cl)ncc1Br, NC1CCOCC1 to produce O=C(NC1CCOCC1)C1COCCN1c1nc(Cl)ncc1Br, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.