2-Norbornanone, 3-(2-chloro-1-chlorodifluoromethyl-2,2-difluoroethylidene)- 3-((2-Chloro-2,2-difluoro-1-(chlorodifluoro)methyl)ethylidene)bicyclo(2.2.1)heptane-2-one 35474-70-5 BRN 2146248 NSC 162062