1-Propanone, 1-(4-methoxyphenyl)-2,2-dimethyl- 2040-26-8 4'-Methoxy-2,2-dimethylpropiophenone 4-Methoxyphenyl tert-butyl ketone NSC177473 Propiophenone, 4'-methoxy-2,2-dimethyl- tert-Butyl 4-methoxyphenyl ketone