benzyl 2-methyl-2-((2R,6S)-6-(2-oxoethyl)tetrahydro-2H-pyran-2-yl)propanoate

benzyl 2-((2R,6S)-6-((S)-2-(benzyloxy)-4-oxobutyl)tetrahydro-2H-pyran-2-yl)-2-methylpropanoate

benzyl 2-((2R,6S)-6-((2R,4R,5S)-2-(benzyloxy)-4-hydroxy-5-methylhept-6-en-1-yl)tetrahydro-2H-pyran-2-yl)-2-methylpropanoate

benzyl 2-((2R,6S)-6-((2S,4R,5S)-2-(benzyloxy)-4-((tert-butyldimethylsilyl)oxy)-7-((2S,6S)-6-(3-(2,2-dimethyl-4-oxo-4H-benzo[d][1,3]dioxin-5-yl)propyl)tetrahydro-2H-pyran-2-yl)-5-methylheptyl)tetrahydro-2H-pyran-2-yl)-2-methylpropanoate