3-Bromo-5-methoxy-benzofuran-2-carboxylic acid 3,3-dimethyl-2-methylene-cyclohexyl ester

1,9-Dioxo-5,5-dimethyl-spiro<5.5>undecan

1-Oxo-5,5,9α-trimethyl-9β-hydroxy-spiro<5.5>undecan