1,4,5,6,7,7-Hexachloro-5-norbornene-2,3-dicarboxylic acid diethyl 1,4,5,6,7,7-Hexachloro-5-norbornene-2,3-dicarboxylic acid diethyl ester 1911-42-8 3-09-00-04050 (Beilstein Handbook Reference) 5-Norbornene-2,3-dicarboxylic acid, 1,4,5,6,7,7-hexachloro-, diethyl ester BRN 3172112 Chlorendic acid, diethyl ester NSC 12450