tert-butyl (2R,3S,5R)-5-cyano-2-{(1R,2S)-2-methoxy-2-methyl-1-[(acetylamino)pentyl]}-3-[(1Z)-prop-1-enyl]pyrrolidine-1-carboxylate

(R)-4-but-3-enoyl-2,2-dimethyloxazolidine-3-carboxylic acid tert-butyl ester

(1S,2S)-(1-formyl-2-methoxy-2-methylpentyl)-carbamic acid tert-butyl ester

tert-butyl ((2R,3S)-1-hydroxy-3-methoxy-3-methylhexan-2-yl)carbamate

(4R,1'S)-4-(1-hydroxy-1-methyl-butyl)-2,2-dimethyloxazolidine-3-carboxylic acid tert-butyl ester