4-Butyl-1-(1-(2-pyridyl)ethylidene)-3-thiosemicarbazide 75013-66-0 KETONE, METHYL 2-PYRIDYL, 4-BUTYL-3-THIOSEMICARBAZONE Semicarbazide, 4-butyl-1-(1-(2-pyridyl)ethylidene)-3-thio-