1,3,4-Metheno-2H-cyclobuta[cd]pentalen-2-one, 1,1a,3,3a,4,5,5,5a,5b-nonachlorooctahydro-;1,3,4-Metheno-2H-cyclobuta[cd]pentalen-2-one, 1,1a,3,4,5,5,5a,5b,6-nonachlorooctahydro-
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