(1α,5α,6α)-6-Amino-3-azabicyclo[3.1.0]hexane-3-carboxylic Acid 1,1-Dimethylethyl Ester, is an intermediate in the preparation of a novel series of Histone Deacetylase (HDAC) Inhibitors, demonstrating class I selectivity and good oral bioavailability. It can also be used in the synthesis of Alatrofloxacin Mesylate (A511400).