(2R,3S,4R,5S)-N-(tert-butoxycarbonyl)-2-[(1,1'-biphenyl-4-carbamoyl)methyl]-3,4-O-isopropylidene-5-methylpyrrolidine-3,4-diol

(2S,3aS,4S,5R,6S)-4,5-isopropylidenedioxy-6-methyl-2-phenoxyhexahydropyrrolo[1,2-b]isoxazole

(2S,3S,4R,5S)-1-benzyl-3,4-isopropylidenedioxy-5-methylpyrrolidinemethylpyrrolidine-2-ethanol

phenyl (2S,3S,4R,5S)-1-benzyl-5-methyl-3,4-isopropylidenedioxypyrrolidine-2-acetate

(3S,4R,5S)-1-acetyl-4,5-isopropylidenedioxy-3-methylhexahydropyridazine