[{"from": "human", "value": "Provide a description of this molecule. [S-2].[S-2].[S-2].[Cr+3].[Cr+3]"}, {"from": "gpt", "value": "The molecule is a sulfide of chromium. Chromium is a chemical element which has the symbol Cr and atomic number 24. It is found naturally occuring in rocks, animals, plants, and soil, and is usually mined as chromite ore. Chromium is most toxic in its +6 oxidation state (chromium(VI)) due to its greater ability to enter cells and higher redox potential. Trivalent chromium (chromium(III)) however, is biologically necessary for sugar and lipid metabolism in humans. (L17)"}]