Chemistry, Biosynthesis and Biological Activity of Artemisinin and Related Natural Peroxides -- Sugar-derived Heterocycles and Their Precursors as Inhibitors Against Glycogen Phosphorylases (GP) -- Cytotoxicity of Heterocyclic Compounds against Various Cancer Cells: A Quantitative Structure–Activity Relationship Study -- Synthesis, Reactivity and Biological Activity of Benzimidazoles -- Heterocyclic Compounds Against the Enzyme Tyrosinase Essential for Melanin Production: Biochemical Features of Inhibition -- Xanthones in Hypericum: Synthesis and Biological Activities -- Chemistry of Biologically Active Isothiazoles -- Structure and Biological Activity of Furocoumarins -- Erratum to Xanthones in Hypericum: Synthesis and Biological Activities.