(R)-2-(2-((2S,3S)-2-((benzyloxy)methyl)-5-oxotetrahydrofuran-3-yl)-2-oxoethyl)-5-ethyl-2-methylfuran-3(2H)-one

(R)-2-[(S)-2-((2S,3R,4R)-2-Benzyloxymethyl-4-isobutyryl-5-oxo-tetrahydro-furan-3-yl)-2-methoxymethoxy-ethyl]-5-ethyl-2-methyl-furan-3-one

(R)-2-((S)-2-((2S,3R,4S)-2-((benzyloxy)methyl)-4-isobutyryl-4-methyl-5-oxotetrahydrofuran-3-yl)-2-(methoxymethoxy)ethyl)-5-ethyl-2-methylfuran-3(2H)-one

(R)-2-((S)-2-((2S,3R)-2-((benzyloxy)methyl)-5-oxotetrahydrofuran-3-yl)-2-hydroxyethyl)-5-ethyl-2-methylfuran-3(2H)-one

(R)-2-((S)-2-((2S,3R)-2-((benzyloxy)methyl)-5-oxotetrahydrofuran-3-yl)-2-(methoxymethoxy)ethyl)-5-ethyl-2-methylfuran-3(2H)-one