C 1947 (OTTO) Chloranilic acid, GR Cas 87-88-7 - used in spectrophotometry. It reacts with metal ions to form stable complexes. C 1947 (OTTO) Chloranilic acid, GR Cas 87-88-7 - used as a reactant in the preparation of dimethylbipyridyl complexes and (nonylbenzimidazolylmethyl)benzene. C 1947 (OTTO) Chloranilic acid, GR Cas 87-88-7 - used in charge-transfer reactions with metoprolol tartrate.