(E)-(S)-5-[(E)-(S)-5-((R)-3-Hydroxy-butyryloxy)-hex-2-enoyloxy]-4-oxo-hex-2-enoic acid

(E)-(S)-5-[(R)-3-(Tetrahydro-pyran-2-yloxy)-hex-5-enoyloxy]-hex-2-enoic acid (S)-1-furan-2-yl-ethyl ester

(E)-(S)-5-Hydroxy-hex-2-enoic acid (S)-2-((S)-1-furan-2-yl-ethoxycarbonyl)-1-methyl-ethyl ester

(E)-(S)-5-Hydroxy-hex-2-enoic acid (R)-2-((S)-1-furan-2-yl-ethoxycarbonyl)-1-methyl-ethyl ester

(E)-(S)-5-Hydroxy-hex-2-enoic acid (S)-1-methyl-2-((E)-(S)-1-methyl-2,5-dioxo-pent-3-enyloxycarbonyl)-ethyl ester