5-25-17-00363 (Beilstein Handbook Reference) 69578-86-5 BRN 0917384 Butanoic acid, 3-((6-chloro-3-pyridazinyl)hydrazono)-, methyl ester GYKI 11616 Methyl 3-((6-chloro-3-pyridazinyl)hydrazono)butanoate