[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is ferrocene substituted on one of the cyclopentadienyl rings by an ethyl group. It derives from a hydride of a ferrocene."}, {"from": "gpt", "value": "[C][C][C-1][CH1-1][CH1-1][CH1-1][CH1-1][Ring1][Branch1].[CH1-1][C][=C][C][=C][Ring1][Branch1].[Fe]"}]