Citation: As. Kende et al., Preparation of 'carba' dipeptides bearing a basic side-chain at the C-terminus: synthesis of enantiopure Boc-D-Phe-Psi[CH2CH2]-L-Arg(NO2)-OH and Boc-D-Phe-Psi[CH2CH2]-D-Arg(NO2)-OH, TETRAHEDR L, 42(35), 2001, pp. 6015-6018