diethyl (2S,3aS,4S,5R,6S)-4,5-isopropylidenedioxy-6-methylhexahydropyrrolo[1,2-b]isoxazole-2-phosphonate

diethyl (2R,3aS,4S,5R,6S)-4,5-isopropylidenedioxy-6-methylhexahydropyrrolo[1,2-b]isoxazole-2-phosphonate

(3aR,6R,6aR)-2,2,6-Trimethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-ylamine

diethyl (2S,3S,4R,5S)-2'-(N-benzyloxycarbonyl-3,4-isopropylidenedioxy-5-methylpyrrolidin-2-yl)ethanephosphonate