Peramivir Impurity 25 Peramivir Impurity 13 Peramivir Impurity 6 4-[[(1,1-DIMETHYLETHOXY)CARBONYL]AMINO]-2-CYCLOPENTENE-1-CARBOXYLIC ACID METHYL ESTER (1S,2S,3R,4R)-Methyl 3-((R)-1-acetaMido-2-ethylbutyl)-4-aMino-2-hydroxycyclopentanecarboxylate Peramivir Impurity 75 Peramivir Impurity 70 Peramivir Impurity 58 Peramivir Impurity 36 Peramivir Impurity 31 Peramivir Impurity 20 Peramivir Impurity 16 Peramivir Impurity 9 Peramivir Impurity 4 Peramivir Impurity 78 Peramivir Impurity 51 Peramivir Impurity 45 Peramivir Impurity 43