Diphenyl acetamidotrichloroethyl fluoronitrophenyl thiourea, CGK733, was claimed to be selective inhibitor of the ataxia telangiectasia-mutated (ATM) protein and ATM- and Rad3-related (ATR) protein, however after investigation of the contents of the original paper by Korean Advanced Institute of Science and Technology (KAIST) several irregularities has been revealed and the paper was retracted in full. Further studies were completed showing that CGK-733 has no specific inhibitory effect on ATM or ATR. Unfortunately, the compound is still being marketed as an ATM/ATR inhibitor. CGK733 inhibits the proliferation of human cancer and non-transformed mouse fibroblast cell lines and induced senescent breast, lung, and colon carcinoma cells to undergo cell death.