Using COC(=O)c1cccc(-c2ncn(-c3ccc(N4CCCC4=O)cc3)n2)c1 to produce COC(=O)c1cccc(-c2ncn(-c3ccc(N4CCCC4)cc3)n2)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.