[{"from": "human", "value": "Describe this molecule. [F][S][Branch1][C][F][Branch1][C][F][Branch1][C][F][Branch1][C][F][F]"}, {"from": "gpt", "value": "The molecule is a contrast agent composed of an inorganic fluorinated inert gas comprised of six fluoride atoms bound to one sulfur atom, with potential diagnostic activity upon imaging. Upon inhalation of sulfur hexafluoride (SF6), the gas is distributed throughout the lungs. Upon subsequent ultrasound imaging, the lung vasculature can be imaged and pulmonary perfusion can be assessed."}]