Using NO, O=C(NN=c1c(=O)c2ccccc2c1=O)Nc1ccccc1 to produce O=C(NN=c1c(=O)c2ccccc2c1=NO)Nc1ccccc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.