N-[(2S,3R,4R)-4-((S)-4-Benzyloxy-2-methoxymethoxy-butyl)-2-methyl-5-oxo-tetrahydro-furan-3-yl]-2,2,2-trifluoro-N-phenyl-acetamide

(3R,4R,5S)-3-((S)-4-Benzyloxy-2-methoxymethoxy-butyl)-5-methyl-4-phenylamino-dihydro-furan-2-one

(4R,5S)-3-[(R)-4-Benzyloxy-2-methoxymethoxy-but-(E)-ylidene]-5-methyl-4-phenylamino-dihydro-furan-2-one

(3S,6R,9R)-6-(2'-benzyloxy)-ethyl-3-methyl-4-phenyl-1,3,4,5,6,9-hexahydro-4-aza-5-oxoisobenzofuran-1-one

(2'R,4R,5S)-3-(4'-benzyloxy-2'-hydroxybutylidene)-4-N-phenylaminodihydro-5-methylfuran-2-one