5-25-17-00363 (Beilstein Handbook Reference) 69578-90-1 BRN 0920201 Butanoic acid, 3-((6-chloro-3-pyridazinyl)hydrazono)-, propyl ester GYKI 11662 Propyl 3-((6-chloro-3-pyridazinyl)hydrazono)butanoate