1H-pyrazol-5-ol, 3-methyl- 3-methyl-1H-pyrazol-5-ol 4344-87-0 5-PYRAZOLONE,3-METHYL InChI=1/C4H6N2O/c1-3-2-4(7)6-5-3/h2H,1H3,(H2,5,6,7