1,2,4,5-Tetramethyl-3-acetylbenzene 2',3',5',6'-Tetramethylacetophenone 2,3,5,6-Tetramethylacetophenone 2142-79-2 Acetophenone, 2',3',5',6'-tetramethyl- Ethanone, 1-(2,3,5,6-tetramethylphenyl)- Methyl duryl ketone NSC74871