1,2,4-Metheno-1H-cyclobuta(cd)pentalene, 1,3,4,5,5,5a,6-heptachlorooctahydro-, (1alpha,1aalpha,2beta,3alpha,3aalpha,4alpha,5aalpha,5balpha,6S*)- 22413-55-4 25631-35-0 28241-01-2 33442-83-0 PHOTOHEPTACHLOR