Table 1. Anti-IAV Activities of Diterpenoids^a.

^aAn influenza virus strain A/Puerto Rico/8/1934, PR8, was used in the assays.

^bConcentration (μM) required to protect cells from the cytocidal effect of PR8 by 50%.

^cThe EC₅₀ (μM) is presented as mean ± SD from at least three independent tests.

^dConcentration (μM) that reduced the viability of MDCK cells by 50%.

^eKnown compounds.

^fNA, Not active.