[{"from": "human", "value": "Please give me some details about this molecule. [CH1-1][CH1-1][CH1-1][CH1-1][CH1-1][Ring1][Branch1].[CH1-1][C][=C][C][=C][Ring1][Branch1].[Fe]"}, {"from": "gpt", "value": "The molecule is a bis(eta(5)-cyclopentadienyl)metal(II) having Fe(II) as the metal(II) species. The parent of the class of ferrocenes. It has a role as a fuel additive. It is a member of ferrocenes and a bis(eta(5)-cyclopentadienyl)metal(II)."}]