Metamizole EP Impurity B

4-Amino-1,2-dihydro-1,5-dimethyl-2-phenyl-3H-pyrazol-3-one|4-Amino-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one;;|4-amino-1,5-dimethyl-2-phenyl-2,3-dihydro-1H-pyrazol-3-one ; 4-Aminophenazone|4-amino-1,5-dimethyl-2-phenyl-2,3-dihydro-1H-pyrazol-3-one ;;|4-Aminoantipyrine|4-Aminophenazone ;|4-Aminophenazone ;;|4-Aminophenazone;|4-Aminophenazone;;|CS-W-00197 ;|Metamizole EP Impurity B;|Metamizole sodium B BP;|Metapirazone;|Solvapyrin A;