1-(6'-Chlorpyridyl-(2'))-3,4-dimethyl-pyrazol-5-on [German] 1-(6-Chloro-2-pyridyl)-3,4-dimethyl-3-pyrazolin-5-one 3-Pyrazolin-5-one, 1-(6-chloro-2-pyridyl)-3,4-dimethyl- UQ8978800