Synonyms: 2,4-Cyclopentadien-1-one,2,3,4,5-tetrachloro-, diethyl acetal (8CI); Cyclopentadienone, tetrachloro-, diethylacetal (6CI,7CI); Cyclopentadiene, 1,2,3,4-tetrachloro-5,5-diethoxy- (8CI);1,1-Diethoxy-2,3,4,5-tetrachlorocyclopenta-2,4-diene;1,2,3,4-Tetrachloro-5,5-diethoxy-1,3-cyclopentadiene;5,5-Diethoxy-1,2,3,4-tetrachloro-1,3-cyclopentadiene; 5,5-Diethoxy-1,2,3,4-tetrachlorocyclopentadiene;NSC 179397