2-Propanone, 1,1,1,3,3,3-hexafluoro-, semicarbazone 400-16-8 Hexafluoroacetone semicarbazone Hydrazinecarboxamide, 2-[2,2,2-trifluoro-1-(trifluoromethyl)ethylidene]- NSC402481 WLN: FXFFYUNMVZXFFF