[
    {
        "name": "cuzn4",
        "formula" : "(B+()2)/A",
        "activeLeg": 
            {
                "vtSymbol": "zn1806",
                "ratio": -2,
                "payup": 2,
                "legname" : "A"
            },

        "passiveLegs": [
            {
                "vtSymbol": "cu1806",
                "ratio": 1,
                "payup": 2,
                "legname" : "B"
            }
        ]
    }

]