052 H 1982-55-4 2,1,3-Benzothiadiazole, 4,5,7-trichloro- 4,5,7-TRICHLORO-2,1,3-BENZOTHIADIAZOLE 4,5,7-Trichlorobenzthiadiazole-2,1,3 BRN 0610334 PH 40-21 TH 052 TH 052-H