5-methyl-1-oxo-2-phenyl-1H-pyrazolo[1,2-a]pyrazol-4-ium-3-olate

anhydro-1-hydroxy-3-oxo-2,5,7-triphenylpyrazolo[1,2-a]pyrazolium hydroxide

苯基丙二酸二乙酯

3,5-dihydroxy-3-phenylpyrazole