(R)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)amino)-2-cyclopentylacetic acid
(R)-2-((tert-Butoxycarbonyl)amino)-2-cyclopentylacetic acid
(S)-2-((Benzyloxy)carbonyl)(methyl)amino)-2-cyclopentylacetic acid
(S)-2-((tert-Butoxycarbonyl)amino)-2-cyclopentylacetic acid
(S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)(methyl)amino)-2-cyclopentylacetic acid
