Fig. (1).

Structures of some natural (a – j) and synthetic phenols (k – n) with antioxidant / antiradical properties (the commonly accepted ring notation and atom numbering are shown where appropriate). a – α-tocopherol; b – miricetin; c – cyanidin; d – curcumin; e– sappanchalcone; f– resveratrol; g– caffeic acid; h– gallic acid; i– esculetin; j– purpurin; k– trolox; l– propyl gallate; m– butylated hydroxytoluene(BHT); n – butylated hydroxyanisole (3-BHA and 2-BHA).