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Izquierdo, S. and Rúa, F. and Sbai, A. and Parella, T. and Álvarez-Larena, Á. and Branchadell, V. and Ortuño, R.M. (2005) (+)- and (-)-2-aminocyclobutane-1-carboxylic acids and their incorporation into highly rigid β-peptides: Stereoselective synthesis and a structural study. Journal of Organic Chemistry, 70 (20). pp. 7963-7971.