Antioxidant Activity Antioxidants Bde Catechols Convex quadratic optimization Dft Dimerization Fungi Hispidin Hydrogen Bonding Interior-point methods Isomerism Models, Molecular Pc-Et Polynomial complexity Pyrones Quantitative Structure-Activity Relationship Short-step method Thermodynamics antioxidant article catechol catechol derivative chemical structure chemistry dimerization fungus hispidin hydrogen bond isomerism