tetrachloro-6-dimethylaminopyridine

6,7,8-trichloro-1,4-dimethyl-2,3-dihydropyrido[2,3-b]pyrazine

5,7,8-trichloro-1,4-dimethyl-2,3-dihydropyrido[3,4-b]pyrazine

2,3,5,6-tetrachloro-4-(2,3,5,6-tetrachloropyridin-4-yl)pyridine