3',9-di-tert-butyl-5',7-dimethyl-2'H,5H-spiro[1,3-benzoxathiepine-4,1'-cyclohexa[3,5]diene]-2,2'-dione InChI=1/C24H30O3S/c1-14-9-16-13-24(12-15(2)11-18(20(24)25)23(6,7)8)28-21(26)27-19(16)17(10-14)22(3,4)5/h9-12H,13H2,1-8H spiro[1,3-benzoxathiepin-4(5H),1'-cyclohexa[3,5]diene]-2,2'-dione, 3',9-bis(1,1-dimethylethyl)-5',7-dimethyl-