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