(4aS,5S,8R,8aR)-8-hydroxy-5,8a-dimethyl-5-(2-((triisopropylsilyl)oxy)ethyl)hexahydro-2H-spiro[naphthalene-1,2'-[1,3]dioxolan]-6(5H)-one

(1aR,2R,3S,3aS,7aR,7bS)-3,7a-dimethyl-3-(2-((triisopropylsilyl)oxy)ethyl)octahydro-3H-spiro[naphtho[1,2-b]oxirene-7,2'-[1,3]dioxolan]-2-ol

(1aS,3S,3aS,7aR,7bS)-3,7a-dimethyl-3-(2-((triisopropylsilyl)oxy)ethyl)hexahydro-3H-spiro[naphtho[1,2-b]oxirene-7,2'-[1,3]dioxolan]-2(1aH)-one