2,3,5,6-Tetrachloro-4-(methanesulfonyl)-pyridine;2,3,5,6-Tetrachloro-4-(methylsulfonyl)pyridine; 4-(Methylsulfonyl)-2,3,5,6-tetrachloropyridine;Algophase; Algophase PH025/d; Densil S; Densil S 100; Densil S 25; Dowco 282;Dowicil S 13; SA 1013; TCMS pyridine