1,4,5,6,7,7-Hexachlorobicyclo(2.2.1)hept-5-ene-2-carboxylic acid 115565-70-3 Bicyclo(2.2.1)hept-5-ene-2-carboxylic acid, 1,4,5,6,7,7-hexachloro-, endo-(+)- Hbheca