[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is a sulfide of lead that occurs naturally as the mineral galena. It is used as a semiconductor and infrared detector. Lead is a heavy metal and stable element with the symbol Pb and the atomic number 82, existing in metallic, organic, and inorganic forms. It is mainly found in nature as the mineral galena (PbS), cerussite (PbCO3) or anglesite (PbSO4), usually in ore with zinc, silver, or copper. (L21, L417)"}, {"from": "gpt", "value": "[S][=Pb]"}]