(-)-(1R,2S)-Cispentacin (-)-Cispentacin (1R-cis)-2-Aminocyclopentanecarboxylic acid 122672-46-2 Antibiotic FR 109615 Cispentacin Cyclopentanecarboxylic acid, 2-amino-, (1R,2S)- Cyclopentanecarboxylic acid, 2-amino-, (1R-cis)- FR 109615 cis-(1R,2S)-2-Aminocyclopentane-1-carboxylic acid