Not Less Than - 95%
3-Amino-4-pyrazolecarboxamide hemisulfate salt; 4-Carboxamide, 5-amino-1H-pyrazole-; 3-Amino-Pyrazole-4-carboxamide Hemisulfate; Allopurinol Impurity A; 5-Amino-1H-pyrazole-4-carboxylic acid amide