(2R,3R,4R)-2-((((R)-1-hydroxy-3-methylbutan-2-yl)amino)methyl)pyrrolidine-3,4-diol

(2R,3R,4R)-2-(((1,3-dihydroxypropan-2-yl)amino)methyl)pyrrolidine-3,4-diol

(2R,3R,4R)-1-(((2R,3R,4R)-3,4-dihydroxypyrrolidin-2-yl)methyl)-2-(hydroxymethyl)piperidine-3,4-diol

(2R,3R,4R)-N-benzyloxycarbonyl-2-((glycineamidyl)methyl)-3,4-dihydroxypyrrolidine

(2R,3R,4R)-N-benzyloxycarbonyl-2-(((S)-alanineamidyl)methyl)-3,4-dihydroxypyrrolidine