(2S,3R,6R,8S,9S)-3,9-dimethyl-8-[(R)-2-hydroxy-1-propyl]-2-[(R)-3-hydroxymethyl-1-pentyl]-1,7-dioxaspiro[5.5]undecan-4-one

(2S,3R,6R,8S,9S)-3,9-dimethyl-8-{(R)-2-[(tert-butyldimethylsilyl)oxy]-1-propyl}-2-{(R)-3-[(tert-butyldimethylsilyl)oxymethyl]-1-pentyl}-1,7-dioxaspiro[5.5]undecan-4-one