Table 2: Cytotoxicity and antiviral activity of derivatives 16c-26c against CV-B5 and Sb-1. Data represent mean values of three independent determinations. Pleconaril was used as a positive control.

Compounds Vero76 CV-B5 Sb-1
- aCC50 bEC50 -
16c >100 53 >100
17c >100 6.9 20.5
18c >100 5.5 17.5
19c >100 >100 >100
20c 87 >87 >87
21c >100 >100 >100
22c >100 >100 >100
23c >100 >100 >100
24c >100 >100 >100
25c >100 >100 >100
26c >100 >100 >100
Ref. compds - - -
Pleconaril 77±6.8 0.005±0.002 2±0.6

aCompound concentration (µM) required to reduce the viability of mock-infected Vero76 monolayers by 50%. bCompound concentration (µM) required to reduce the plaque number of the indicated virus by 50% in Vero76 monolayers.