[{"from": "human", "value": "Provide a description of this molecule. [C][C][Pb][Branch1][Ring1][C][C][Branch1][Ring1][C][C][C][C]"}, {"from": "gpt", "value": "The molecule is an organolead compound produced by reacting ethyl chloride with a sodium-lead alloy. It was originally used as an antiknock additive in gasoline, but is now found only in some aircraft fuels. 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, L419)"}]