1H-pyrazolium, 4,5-dihydro-3-(2-hydroxyethoxy)-4-(methoxycarbonyl)-1,1-dimethyl-5-oxo-, inner salt 3-(2-hydroxyethoxy)-4-(methoxycarbonyl)-1,1-dimethyl-5-oxo-4,5-dihydro-1H-pyrazol-1-ium-4-ide InChI=1/C9H14N2O5/c1-11(2)8(13)6(9(14)15-3)7(10-11)16-5-4-12/h12H,4-5H2,1-3H