4-(2-(6-Chloro-3-pyridazinyl)hydrazinylidene)valeric acid 5-25-17-00363 (Beilstein Handbook Reference) 69579-00-6 BRN 0916076 Pentanoic acid, 4-((6-chloro-3-pyridazinyl)hydrazono)- Valeric acid, 4-(2-(6-chloro-3-pyridazinyl)hydrazinylidene)-