[
    {
        "medium_id": "J655",
        "compound": "GAM agar",
        "g_l": 56.7,
        "mmol_l": null,
        "optional": "no"
    },
    {
        "medium_id": "J655",
        "compound": "Distilled water",
        "g_l": null,
        "mmol_l": null,
        "optional": "no"
    }
]