Phosphoric acid (1R,3aR,7aR)-1-tert-butoxy-7a-methyl-2,3,3a,6,7,7a-hexahydro-1H-inden-4-ylmethyl ester diethyl ester

(3R,3aR,7aR)-3-tert-Butoxy-3a,7-dimethyl-2,3,3a,4,5,7a-hexahydro-1H-indene

(3R,3aR)-3-tert-Butoxy-3a,7-dimethyl-3,3a,4,5-tetrahydro-2H-indene-1,6-dione

(1R,7aR)-1-tert-Butoxy-7a-methyl-3,5-dioxo-2,3,5,6,7,7a-hexahydro-1H-indene-4-carboxylic acid methyl ester

(1R,3aS,7aR)-1-tert-Butoxy-7a-methyl-6-oxo-2,3,3a,6,7,7a-hexahydro-1H-indene-4-carboxylic acid methyl ester