An and coworkers reported that the small molecule NA inhibitor
NSC89853 (11), which is structurally different from other SA mimics,
could possibly bind to the pocket formed by the 430-loop based on
molecular modeling43. Feng, et al.44 , recently designed and synthesized
a series of zanamivir analogs with an extended side chain at 1-
position (e.g., 12) projected towards the 430-loop. The most potent
compound 12 shows an IC50 in low nmol/L range against both group-1
and group-2 NAs, demonstrating the potential of “430-cavity” as a
powerful strategy in the design of new NA inhibitors.