1,2,4-ethanylylidene-5H-cyclobuta[cd]pentalene-5,7-dione, 1a,2,3a,5b-tetrachlorooctahydro-3,3-dimethoxy-;2,3,5,6-Tetrachloro-4,4-dimethoxypentacyclo[5.4.0.0~2,6~.0~3,10~.0~5,9~]undecane-8,11-dione
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