SEARCH Articles Figures Tables Carbon sulfur Carbon-nitrogen-metal rings Carbon-nitrogen-sulfur-metal rings Carbon-phosphorus Carbon-sulfur rings Carbon—nitrogen rings Metal nitrogen Metal rings Metal sulfur Metal sulfurization Metal-nitrogen-carbon Nitrogen-phosphorus rings Phosphorus rings Phosphorus sulfur Phosphorus-nitrogen-sulfur rings Phosphorus-sulfur rings Ring Carbon Sulfur ring Sulfur-nitrogen Sulfur-nitrogen rings