Zanamivir
... It was known as far back as 1974 that 2-deoxy-2,3-didehydro-
N-acetylneuraminic acid (DANA), a sialic acid analogue, was an inhibitor of neuraminidase (Meindl et al., 1974). ... Meindl P, Bodo G, Palese P,...
http://en.wikipedia.org/wiki/Zanamivir