[{"from": "human", "value": "Could you give me a brief overview of this molecule? [CH1-1][C][=C][C][=C][Ring1][Branch1].[CH1-1][C][=C][C][=C][Ring1][Branch1].[Cr+2]"}, {"from": "gpt", "value": "The molecule is a chemical compound with the condensed structural formula . Each molecule contains an atom of chromium bound between two planar systems of five carbon atoms known as cyclopentadienyl (Cp) rings in a sandwich arrangement, which is the reason its formula is often abbreviated as Cp2Cr.  Chromium compounds are toxic, although Cr(VI) species are usually considered more dangerous than reduced chromium compounds. Chromocene is highly reactive toward air and could ignite upon exposure to the atmosphere."}]