Several cyclopentene GABA analogues were synthesized as conformationally rigid analogues of the epilepsy drug vigabatrin and tested as inhibitors and substrates of γ- aminobutyric acid aminotransferase (GABA-AT). None of these compounds produced time- dependent inhibition.(1 R, 4 S)-(+)-4-Amino-2-cyclopentene-1-carboxylic acid ((+)-3),(4 R)-(- )-4-amino-1-cyclopentene-1-carboxylic acid ((-)-4), and d, l-3-amino-1-cyclopentene-1- ...