1H-pyrazole-5-carboxylic acid, 3-hydroxy-1-methyl-, ethyl ester InChI=1/C7H10N2O3/c1-3-12-7(11)5-4-6(10)8-9(5)2/h4H,3H2,1-2H3,(H,8,10 ethyl 3-hydroxy-1-methyl-1H-pyrazole-5-carboxylate