2654-58-2 3-Pyrazolidinone, 4,4-dimethyl-1-phenyl- 4,4-Dimethyl-1-phenyl-3-pyrazolidinone 4,4-Dimethyl-1-phenyl-3-pyrazolidone 4,4-Dimethylphenidone Dimezone EINECS 220-181-1 NSC 215239