Tetrahedron Letters Volume 25, Issue 40, 1984, Pages 4479-4482
V. Teetz, *, R. Geiger and H. Gaul
Synthesis of unnatural amino acids: (S,S,S)-2-azabicyclo[3.3.0]octane-3-carboxylic acid
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http://dx.doi.org//10.1016/S0040-4039(01)81471-4