[
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        "identifier": {
            "cas": "74-98-6",
            "name": "propane",
            "iupac_name": "propane",
            "smiles": "CCC",
            "inchi": "InChI=1/C3H8/c1-3-2/h3H2,1-2H3",
            "formula": "C3H8"
        },
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            "pc": 4250000.0,
            "acentric_factor": 0.153
        },
        "molarweight": 44.0962
    },
    {
        "identifier": {
            "cas": "106-97-8",
            "name": "butane",
            "iupac_name": "butane",
            "smiles": "CCCC",
            "inchi": "InChI=1/C4H10/c1-3-4-2/h3-4H2,1-2H3",
            "formula": "C4H10"
        },
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        },
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    }
]