Boesenbergia rotunda derivatives, specifically 4-hydroxypanduratin A and panduratin A, effectively inhibit the dengue 2 virus NS3 protease with Ki values of 21 and 25 microM.
Pinostrobin and cardamonin demonstrated non-competitive inhibition against the same protease.
The structures of the six isolated compounds were determined using NMR and GCMS spectroscopy techniques.