2,3,4,5-tetra-tert-butylcyclopenta-2,4-dien-1-one 2,4-cyclopentadien-1-one, 2,3,4,5-tetrakis(1,1-dimethylethyl)- InChI=1/C21H36O/c1-18(2,3)13-14(19(4,5)6)16(21(10,11)12)17(22)15(13)20(7,8)9/h1-12H