(1R,2R,3S,4S)-3-((S)-1-acetaMido-2-ethylbutyl)-4-guanidino-2-hydroxycyclopentanecarboxylic acid

(1S,2R,3R,4R)-3-[(1S)-1-acetamido-2-ethyl-butyl]-4-(diaminomethylideneamino)-2-hydroxy-cyclopentane-1-carboxylic acid

Cyclopentanecarboxylic acid, 3-((1R)-1-(acetylamino)-2-ethylbutyl)-4-((aminoiminomethyl)amino)-2-hydroxy-, (1R,2R,3S,4S)-rel-