1-(Ethoxycarbonyl)-2-propylidene-(6-chloro-3-pyridazinyl)hydrazine 31171-41-2 5-25-17-00363 (Beilstein Handbook Reference) Acetoacetic acid, ethyl ester, 3-((6-chloro-3-pyridazinyl)hydrazone) BRN 0536671 Butanoic acid, 3-((6-chloro-3-pyridazinyl)hydrazono)-, ethyl ester Ethyl 3-((6-chloro-3-pyridazinyl)hydrazono)butanoate GYKI 11473