ALLOPURINOL IMPURITY C;5-(4H-1,2,4-Triazol-4-yl)-1H-pyrazole-4-carboxamide;Allopurinol Impurity 3(Allopurinol EP Impurity C)(Allopurinol USP Related Compound C );synthesis-005;Allopurinol Related CoMpound C;Allopurinol-001;5-(1,2,4-triazol-4-yl)-1H-pyrazole-4-carboxamide;Allopurinol EP Imp C