Using di-tert-butyl iminodicarbonate, methyl 9-((1R,4S)-4-((ethoxycarbonyl)oxy)cyclopent-2-en-1-yl)-6-(((S)-1-hydroxy-3-phenylpropan-2-yl)amino)-9H-purine-2-carboxylate to produce methyl 9-((1R,4S)-4-(bis(tert-butoxycarbonyl)amino)cyclopent-2-en-1-yl)-6-(((S)-1-hydroxy-3-phenylpropan-2-yl)amino)-9H-purine-2-carboxylate, 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"
    ]
}
```
