(R)-3-Methyl-6-[(S)-1-((4R,5R)-2,2,5-trimethyl-[1,3]dioxan-4-yl)-ethyl]-5,6-dihydro-pyran-2-one

(R)-4-Pyrrolidin-1-yl-6-[(S)-1-((4R,5R)-2,2,5-trimethyl-[1,3]dioxan-4-yl)-ethyl]-5,6-dihydro-pyran-2-one

(5R,6S)-5-Methylsulfanyl-4-pyrrolidin-1-yl-6-[(R)-1-((4R,5R)-2,2,5-trimethyl-[1,3]dioxan-4-yl)-ethyl]-5,6-dihydro-pyran-2-one

(1S,5R,6S,7S,8S)-7-Benzyloxy-6,8-dimethyl-2,9-dioxa-bicyclo[3.3.1]nonan-3-one