Assertion: drug | /r/HasProperty | introduced constant
Facets:
value: recently
type: TEMPORAL
value: to treat influenza
type: PURPOSE
Source sentences:
text: Two drugs named zanamivir (Relenza) and oseltamivir (Tamiflu) that have been recently introduced to treat influenza prevent the release of viral particles by blocking a molecule named neuraminidase that is found on the surface of flu viruses, and also seems to be constant across a wide range of flu strains.