tert-butyl N-[(1R)-1-((2R)-2,5-dihydrofuran-2-yl)-2-hydroxyethyl]carbamate

(4aR,8S,8aR)-tert-butyl hexahydro-8-hydroxy-2,2-dimethyl[1,3]dioxino[5,4-b]pyridine-5-carboxylate

(4aR,8aR)-7,8-Dihydroxy-2,2-dimethyl-hexahydro-[1,3]dioxino[5,4-b]pyridine-5-carboxylic acid tert-butyl ester

(R)-4-(S)-2,5-Dihydro-furan-2-yl-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester

(R)-4-(R)-2,5-Dihydro-furan-2-yl-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester