Zanamivir DESCRIPTION From our sponsors: . From our sponsors: The active component of RELENZA is zanamivir. The chemical name of zanamivir is 5-( acetylamino)- 4- - 2, 6- anhydro- 3, 4, 5- trideoxy- D- glycero- D- galacto- non- 2- enonic acid. It has a molecular formula of C12H20N4O7 and a molecular weight of 332.3. Zanamivir is a white to off-white powder with a solubility of approximately 18 ...