4’,4’,6,6-tetramethyl-3-(p-tolyl)-6,7-dihydro-3H-spiro[benzofuran-2,1’-cyclohexane]-2’,4,6’(5H)-trione

4',4',6,6-tetramethyl-2-(p-tolyl)-6,7-dihydro-2H-spiro[benzofuran-3,1'-cyclohexane]-2',4,6'(5H)-trione

5,5-二甲基-1,3-环己二酮

5,5-dimethyl-2-(triphenyl-l5-stibaneylidene)cyclohexane-1,3-dione