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Lack of cytotoxicity of compounds 1 and 2 on HeLa cells. Uninfected HeLa cells were cultured with medium containing various concentrations of individual compound or 0.5% DMSO for 48 h. (a) The cellular morphology was stained with Evans blue, and cell nucleus was stained with DAPI. (b) The cells were enumerated by a hemacytometer. Data are presented as mean ± SD of three independent assays.
