Using O=C[O-], Ic1ccc2[nH]nc(-c3nc4ccccc4[nH]3)c2c1 to produce O=Cc1ccc2[nH]nc(-c3nc4ccccc4[nH]3)c2c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.