Pyrimido[5,4-d]pyrimidine,tetrachloro- (9CI);2,4,6,8-Tetrachloropyrimido[5,4-d]pyrimidine;Pyrimido[5,4-d]pyrimidine,2,4,6,8-tetrachloro-;Tetrachloropyrimido[5,4-d]pyrimidine;
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