Synonyms: Peramivir; RWJ-270201; BCX-1812; (1S,2S,3R,4R)-3-[1(S)-(Acetylamino)-2-ethylbutyl]-4-[[amino(imino)methyl]amino]-2-hydroxycyclopentanecarboxylic acid; (1S,2S,3S,4R)-3-(1-acetamido-2-ethyl-butyl)-4-guanidino-2-hydroxy-cyclopentane-1-carboxylic acid; (1S,2S,3S,4R)-3-[(1S)-1-(acetylamino)-2-ethylbutyl]-4-[(diaminomethylidene)amino]-2-hydroxycyclopentanecarboxylic acid; (1S,2R,3R,4R)-3-[(1S)-1-acetamido-2-ethyl-butyl]-4-(diaminomethylideneamino)-2-hydroxy-cyclopentane-1-carboxylic acid; (1S,2S,3R,4R)-3-[(1S)-1-(Acetylamino)-2-ethylbutyl]-4-[(aminoiminomethyl)amino]-2-hydroxycyclopentanecarboxylic acid