Using 5,7-di-tert-butyl-3-hydroxybenzofuran-2(3H)-one to produce 5,5',7,7'-tetra-tert-butyl-2H,2'H-[3,3'-bibenzofuranylidene]-2,2'-dione, 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"
    ]
}
```
