ALP01S: Allopurinol EP Impurity A

ALP01S: Allopurinol EP Impurity A

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Allopurinol EP Impurity A ;

Allopurinol USP RC A ;

5-Amino-1H-pyrazole-4-carboxamide hemisulfate ;

CAS # 27511-79-1 (Hemisulfate) ; 5334-31-6 (Base) ; 

C4H6N4O (free base) ; MW 126.12 ;

C4H6N4O . ½ H2SO4 ; MW: 175.16 ;