tert-butyl (1S,4R)-4-(hydroxyMethyl)cyclopent-2-enylcarbaMate

N-[(1R,3S)-3-(Hydroxymethyl)cyclopentyl]carbamic Acid 1,1-Dimethylethyl Ester is used in the synthesis of (1R,4S)-4-Aminocyclopent-2-en-yl methanol HCl, an undesired isomer of key starting material in the synthesis of abacavir sulphate.