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Explaining different possible interactions of compound 19 with the main protease of COVID-19. (a) a 3D interaction diagram of 19 with the protease is shown in stick and surface models. The hydrogen bonds are shown in the form of green dots and the π–interactions are marked with red dotted lines. (b) And (c) 2D interaction diagram of 19 with the protease. Hydrogen bond interactions are indicated with green dashed lines.
