trans-4-Hydroxy-tetrahydrofuran-carbonsaeure-(2)-methylester
methyl cis-4-tosyloxytetrahydrofuran-2-carboxylate
trans-4-(N-tosylamino)tetrahydrofuran-2-carboxylic acid
(2R,4S)-4-Amino-tetrahydro-furan-2-carboxylic acid methyl ester
trans-4-aminotetrahydrofuran-2-carboxylic acid