Abstract
AbstractThe ethanol extract from the leaves and twigs of Euphorbia cyathophora showed antiviral activity against four dengue virus serotypes (DENV1‐4), with PRNT50 values of 15.625‐62.5 μg/mL. Eight compounds including germanicol acetate (1), cymbopogone (2), 1‐heptacosanol (3), ethyl α‐L‐arabinofuranoside (4), quercetin (5), 3‐acetoxy‐5,7,3’,4’‐tetrahydroxyflavone (6), 3‐acetoxy‐5,7,4’‐trihydroxyflavone (7), 4’‐acetoxy‐3,5,7‐trihydroxyflavone (8) were isolated from this extract. Compounds 2‐8 were isolated for the first time from Euphorbia cyathophora. Antiviral activity evaluation of compounds 1‐3, 5‐7 on DENV1‐4 serotypes revealed that 7 was the most active compound with PRNT50 values of 23.8‐95.2 μM.
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