[{"from": "human", "value": "Provide a brief overview of this molecule. [C][=C][C][=C-1][C][=C][Ring1][=Branch1].[C][=C][C][=C-1][C][=C][Ring1][=Branch1].[Mg+2]"}, {"from": "gpt", "value": "The molecule appears as a whitish to gray crystalline solid. Denser than water. Contact may irritate skin, eyes and mucous membranes. Used to make other chemicals."}]