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BACKGROUND Norfloxacin like other fluoroquinolones, is known to mbe mutagenic for Salmonella typhimurium TA102 strain. This mutagenic effect is due to free oxygen radicals (ROS), because it is inhibited by antioxidants such as beta-carotene and naturally occurring antioxidants of Roheo discolor and other plants. The aim of this work was to evaluate… (More)
[structure: see text] A series of cyclic hydrocarbons containing a planar tetracoordinate carbon atom is proposed. To rationalize the electronic factors contributing to the stability of these molecules, an analysis of the molecular orbitals and the induced magnetic field is presented.