Using (R)-3-((9-(6,8-difluorochroman-4-yl)-8-oxo-8,9-dihydro-7H-purin-2-yl)amino)-4-((2,4-dimethoxybenzyl)amino)benzonitrile to produce (R)-4-amino-3-((9-(6,8-difluorochroman-4-yl)-8-oxo-8,9-dihydro-7H-purin-2-yl)amino)benzonitrile, 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"
    ]
}
```
