Using CCN=C=NCCCN(C)C, COC(=O)c1scc(Br)c1OC(C)C(=O)O to produce COC(=O)c1scc(Br)c1OC(C)C(N)=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.