MMZ03H: Metamizole EP Impurity C

4-Methylamino Antipyrine HCl ;

1,5-Dimethyl-4-(methylamino)-2-phenyl-2,3-dihydro-1H-pyrazol-3-one HCl ;

CAS # 519-98-2 (base) ; 856307-27-2 (HCl) ;

C12H15N3O (base) ; Mol. Wt.: 217.27 ;

C12H16ClN3O (HCl) ; Mol. Wt.: 253.73 ;