3.3. Effects of isolated compounds on the activity of neuraminidases (NAs) from influenzas A/PR/8/34 (H1N1), A/chicken/Korea/01210/2001 (H9N2), novel H1N1 (WT), and oseltamivir-resistant novel H1N1 (H274Y) expressed in 293T cells.
Inhibitory activities of compounds 1−13 were assessed against NAs from influenzas A/PR/8/34 (H1N1) and A/chicken/Korea/01210/2001 (H9N2) using oseltamivir phosphate (Hoffman-La Roche Ltd., Basel, Switzerland) as a positive control. All compounds inhibited NAs in a dose-dependent manner (Table 2 and Fig. 3A and B). The oxyaryl compounds with the unsaturated CCCO unit showed significant activity towards NAs as in the most active compound 9 (IC50 6.18 ± 0.64 μg/ml).