1-oxa-4-thiaspiro[4.5]decan-2-one, 8-(1,1-dimethylethyl)-3,3-diphenyl- 8-tert-butyl-3,3-diphenyl-1-oxa-4-thiaspiro[4.5]decan-2-one InChI=1/C24H28O2S/c1-22(2,3)18-14-16-23(17-15-18)26-21(25)24(27-23,19-10-6-4-7-11-19)20-12-8-5-9-13-20/h4-13,18H,14-17H2,1-3H