3',5,5',7-tetra-tert-butyl-3-methyl-2'H,3H-spiro[1-benzofuran-2,1'-cyclohexa[3,5]dien]-2'-one InChI=1/C30H44O2/c1-18-21-14-19(26(2,3)4)15-22(28(8,9)10)24(21)32-30(18)17-20(27(5,6)7)16-23(25(30)31)29(11,12)13/h14-18H,1-13H spiro[benzofuran-2(3H),1'-cyclohexa[3,5]dien]-2'-one, 3',5,5',7-tetrakis(1,1-dimethylethyl)-3-methyl-