Synonyms: 3,5,6,7-Tetrahydro-4',4',6,6-tetramethylspiro[benzofuran-2(4H),1'-cyclohexane]-2',4,6'-trione;4',4',6,6-Tetramethyl-3,5,6,7-tetrahydrospiro[benzofuran-2(4H),1'-cyclohexane]-2',4,6'-trione;4',4',6,6-Tetramethyl-4,5,6,7-tetrahydrospiro[benzofuran-2(3H),1'-cyclohexane]-2',4,6'-trione