(2R,3S)-3-isopropylamino-3-pentene-1,2-diol

(2S,3S)-3-amino-4-pentene-1,2-diol

[(4S,5S)-2,2-dimethyl-5-vinyl-1,3-dioxolan-4-yl]methyl 4-methyl-benzenesulfonate

(2S,3S)-1-p-toluenesulfonyl-4-buten-1,2,3-triol