Using O=C(O)c1cc(-c2c(-c3ccccc3)nn3ccccc23)c[nH]c1=O to produce O=c1ccc(-c2c(-c3ccccc3)nn3ccccc23)c[nH]1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.