Using methyl 3-(4-(2-oxo-3-propyl-6-thioxo-2,3,6,7-tetrahydro-1H-purin-8-yl)bicyclo[2.2.2]octan-1-yl)propanoate, iodomethane to produce methyl 3-(4-(6-(methylthio)-2-oxo-3-propyl-3,7-dihydro-2H-purin-8-yl)bicyclo[2.2.2]octan-1-yl)propanoate, please predict the condition, including solvent and agent in SMILES notation in json format like:

```JSON
{
    "solvent": [
        "CCN(CC)CC",
        "CCOC(C)=O"
    ],
    "agent": [
        "On1nnc2ccccc21",
        "C(=NC1CCCCC1)=NC1CCCCC1",
        "Cl"
    ]
}
```
