Using NCCN, N#Cc1ccc(CCN2C(=O)c3ccccc3C2=O)cc1 to produce O=C1c2ccccc2C(=O)N1CCc1ccc(C2=NCCN2)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.