tert-butyl (4S)-4-[(R)-hydroxy-[(2R)-5-oxo-2H-furan-2-yl]methyl]-2,2-dimethyl-1,3-oxazolidine-3-carboxylate

(5-oxo-2H-furan-2-yl) acetate

tert-butyl (4R)-4-[(R)-hydroxy-[(2R)-5-oxo-2H-furan-2-yl]methyl]-2,2-dimethyl-1,3-oxazolidine-3-carboxylate

6,7-N,O-Isopropylidene-6-[(tert-butoxycarbonyl)amino]-2,3,6-trideoxy-D-ribo-hept-2-enono-1,4-lactone

1a,7b-dihydro-1H-cyclopropa[a]naphthalene-1-carboxylic acid