(3aR,4S,5S,6aS)-5-[[(1,1-Dimethylethyl)dimethylsilyl]oxy]hexahydro-N-[(1R)-2-hydroxy-1-phenylethyl]-5,5-dimethyl-spiro[1,3-dioxane-2,2(1H)-pentalene]-4-carboxamide
(3a'R,4S,5S,6aS)-5'-((tert-ButyldimethySilyl)oxy)-N-(S)-2-hydroxy-1-phenylethyl)-5,5-dimethylhexahydro-1'HSpiro[[1,3]dioxane-2,2'-pentalene]-4'-carboxamide