Using CN, CN(Cc1c2ccccc2c(C=O)c2ccccc12)C(=O)OC(C)(C)C to produce CNCc1c2ccccc2c(CN(C)C(=O)OC(C)(C)C)c2ccccc12, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.