1,3,4,6,7,8,8-Heptachlorohexahydro-4,7-methanoisobenzofuran-5(3H)-one 3447-87-8 4,7-Methanoisobenzofuran-5(3H)-one, 1,3,4,6,7,8,8-heptachlorohexahydro- ENT 27,236 HRS 1671 Hooker hrs-1671