41621-10-7

Allopurinol impurity 17 Nicotinamide Impurity 64 Allopurinol EP Impurity H 5-amino-1H-pyrazole-4-carbohydrazide 3-Aminopyrazole-4-carboxylic Acid Hydrazide 1H-Pyrazole-4-carboxylic acid, 3-aMino-, hydrazide 1H-Pyrazole-4-carboxylicacid,3-amino-,hydrazide(9CI)