(2S,3S)-3-azido-2-hydroxypent-4-yn-1-yl pivalate

2,2-Dimethyl-propionic acid (2S,3S)-3-acetylamino-2,3-dihydro-furan-2-ylmethyl ester

2,2-Dimethyl-propionic acid (2S,3S)-2-hydroxy-3-(2,2,2-trifluoro-acetylamino)-pent-4-ynyl ester

((2S,3S)-3-(2,2,2-trifluoroacetamido)-2,3-dihydrofuran-2-yl)methyl pivalate