Using O=C(O)c1cc2[nH]c(=O)c3nnc(C4CCOCC4)n3c2cc1Br, O=C([O-])O to produce COC(=O)c1cc2[nH]c(=O)c3nnc(C4CCOCC4)n3c2cc1Br, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.