(S)-2-Amino-N-ethyl-N-(4-nitro-benzyl)-propionamide

(S)-2-Amino-N-isopropyl-N-(3-nitro-benzyl)-propionamide

(S)-2-Amino-N-cyclopropyl-N-(2-iodo-benzyl)-propionamide

(S)-2-Amino-N-(3-methoxy-benzyl)-3-methyl-butyramide

(S)-2-Amino-N-(2-bromo-benzyl)-3,N-dimethyl-butyramide

(S)-2-Amino-N-(3-cyano-benzyl)-3,N-dimethyl-butyramide

(S)-2-Amino-N-ethyl-N-(2-iodo-benzyl)-3-methyl-butyramide

(S)-2-Amino-N-(2-bromo-benzyl)-N-isopropyl-3-methyl-butyramide

(S)-2-Amino-N-isopropyl-3-methyl-N-(3-trifluoromethyl-benzyl)-butyramide

(S)-2-Amino-N-cyclopropyl-3-methyl-N-(3-trifluoromethyl-benzyl)-butyramide

(3-Trifluoromethyl-benzylamino)-acetic acid

[Ethyl-(3-nitro-benzyl)-amino]-acetic acid

[(3-Cyano-benzyl)-ethyl-amino]-acetic acid

[(3-Cyano-benzyl)-isopropyl-amino]-acetic acid

[Cyclopropyl-(2-methoxy-benzyl)-amino]-acetic acid