1-(2,3,5,6-tetramethylphenyl)ethanone 2142-79-2 InChI=1/C12H16O/c1-7-6-8(2)10(4)12(9(7)3)11(5)13/h6H,1-5H ethanone, 1-(2,3,5,6-tetramethylphenyl)-