22808-29-3 3,6-Dichloro-4-(1,1-dimethylethyl)pyridazine 3,6-Dichloro-4-tert-butylpyridazine 4-tert-Butyl-3,6-dichloropyridazine Pyridazine, 3,6-dichloro-4-(1,1-dimethylethyl)- Pyridazine, 4-tert-butyl-3,6-dichloro-