Using NNC=O, COc1ccc(C(CC(=O)O)N2C(=O)c3ccccc3C2=O)cc1OC to produce COc1ccc(C(Cc2nnco2)N2C(=O)c3ccccc3C2=O)cc1OC, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.