(2R,4S)-4-Hydroxy-tetrahydro-furan-2-carboxylic acid methyl ester
(2R,4R)-4-Hydroxy-tetrahydro-furan-2-carboxylic acid methyl ester
N-tosyl-2-oxa-5-azabicyclo<2.2.1>heptan-6-one
cis-4-aminotetrahydrofuran-2-carboxylic acid
(2R,4R)-4-Amino-tetrahydro-furan-2-carboxylic acid methyl ester