1,2-Bis(methoxycarbonyl)-ethylidene-(6-chloro-3-pyridazinyl)hydrazine 5-25-17-00363 (Beilstein Handbook Reference) 69579-24-4 BRN 0928449 Butanedioic acid, ((6-chloro-3-pyridazinyl)hydrazono)-, dimethyl ester Dimethyl ((6-chloro-3-pyridazinyl)hydrazono)butanedioate