Using CCCC(=O)C1=C(O)CC(c2c(C)nc(C)nc2C)CC1=O, CCON to produce CCCC(=NOCC)C1=C(O)CC(c2c(C)nc(C)nc2C)CC1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.