title: The synthesis of stable "tetravalent sulfur" heterocycles.
mesh_terms: D001952:Bridged-Ring Compounds / Q000138:chemical synthesis*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D011720:Pyrazoles / Q000138:chemical synthesis; D013057:Spectrum Analysis; D013876:Thiophenes / Q000138:chemical synthesis*; D014466:Ultraviolet Rays
chemical_list: D001952:Bridged-Ring Compounds; D011720:Pyrazoles; D013876:Thiophenes