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  • Metamizole
  • Metamizole or dipyrone, is an ampyrone sulfonate painkiller, spasm reliever and fever reliever. (wikipedia.org)
  • Pyrazolone moiety (a five-membered lactam ring containing two nitrogens and ketone in the same molecule or alternatively a derivative of pyrazole possessing an additional carbonyl/hydroxy group) has been the focus of medicinal chemists for over last 100 years because of the outstanding pharmacological properties shown by several of its derivatives 1 e.g. ampyrone, metamizole etc. (scielo.br)