[{"from": "human", "value": "Describe this molecule. [C][#Branch1][C][#N][S-1].[C][#Branch1][C][#N][S-1].[Pb+2]"}, {"from": "gpt", "value": "The molecule is a chemical compound of lead and cyanide. 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)"}]