phenicarbazide phenicarbazide phenicarbazide is a semicarbazide and an antipyretic substance. it is carcinogenic in mice. phenicarbazideclinical dataother names1-phenylsemicarbazide; kryogeninatc codenoneidentifiers iupac name 2-phenylhydrazinecarboxamide cas number103-03-7 nchemspider54963 yunii1lr2578324keggc19498 ncomptox dashboard (epa)dtxsid9020245 echa infocard100.002.794 chemical and physical dataformulac7h9n3omolar mass151.169 g·mol−1 inchi inchi=1s/c7h9n3o/c8-7(11)10-9-6-4-2-1-3-5-6/h1-5,9h,(h3,8,10,11) ykey:avkhckxgkpagei-uhfffaoysa-n y ny (what is this?) (verify) preparation phenicarbazide can be obtained by mixing phenylhydrazine with acetic acid in aqueous solution with the addition of potassium cyanide. it is also obtained from the reaction of phenylhydrazine with urea. properties phenicarbazide is a flammable, hard to ignite, crystalline, beige solid that is practically insoluble in water. it decomposes on heating. uses phenicarbazide is an intermediate in the syntheses of a series of chemical compounds by cyclocondensation reactions. it was investigated as an analgesic and antipyretic in the 1970s and was used in combination preparations.