Synonyms: 33461-30-2;2-hydroxy-5,7-dimethyl-2,3-dihydro-1H-pyrazolo(1,2-a)pyrazol-4-ium tetraphenylborate(1-);2-hydroxy-5,7-dimethyl-2,3-dihydro-1H-pyrazolo[1,2-a]pyrazol-4-ium tetraphenylborate(1-);NSC94493;AC1LAYE0;NSC 94493;1,3-dimethyl-6,7-dihydro-5H-pyrazolo[1,2-a]pyrazol-4-ium-6-ol; tetraphenylboranuide