... (1S,2S,3S,4R)-3-[(1S)-1-acetamido-2-ethylbutyl]-4-(diaminomethylideneamino)-2-hydroxycyclopentane-1-carboxylic acid.3. Properties : Peramivir Purity: >99% Density: 1.39 g/cm3 Formula ... requirement; MOQ: 1kg Delivery: within 3days (1S,2S,3S,4R)-3-[(1S)-1-Acetamido-2-ethylbutyl]-4-[(diaminomethylene)amino]-2-hydroxycyclopentanecarboxylic acid