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

(S)-2,2-二甲基-4-乙烯基噁唑啉-3-羧酸叔丁酯

tert-butyl (4R)-4-ethenyl-2,2-dimethyl-1,3-oxazolidine-3-carboxylate

(4S)-4-乙炔基-2,2-二甲基-1,3-噁唑烷-3-甲酸叔丁酯