5-(2-(6-Chloro-3-pyridazinyl)hydrazinylidene)hexanoic acid ethyl ester 5-25-17-00363 (Beilstein Handbook Reference) 69578-88-7 BRN 0922130 GYKI 11633 Hexanoic acid, 5-((6-chloro-3-pyridazinyl)hydrazono)-, ethyl ester Hexanoic acid, 5-(2-(6-chloro-3-pyridazinyl)hydrazinylidene)-, ethyl ester