[
    {
        "id": 1282,
        "name": "Iron",
        "group": "Iron powder",
        "chebi_id": 18248,
        "cas": "7439-89-6",
        "kegg_id": "C00023",
        "mass": 55.84,
        "formula": "Fe",
        "density": null,
        "biological roles": null
    }
]