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Thermostabilizing properties of 7a and 4 in comparison to 2a. Values are the mean ± SD of four independent experiments. The legend shows the concentration of each compound tested. The asterisk indicates the significance of the difference in virus titer for 2a, 4, 7a at 49.9 °C and 52.4 °C relative to the virus control, p < 0.05 by Mann–Whitney U-test.
