Using 4-(tert-butyl) 1-(2,5-dioxopyrrolidin-1-yl) ((benzyloxy)carbonyl)-L-aspartate, tert-butyl L-valinate to produce tert-butyl (S)-3-(((benzyloxy)carbonyl)amino)-4-(((S)-1-(tert-butoxy)-3-methyl-1-oxobutan-2-yl)amino)-4-oxobutanoate, 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"
    ]
}
```
