Using COc1ccc2c(c1)CCC(N)C2, O=C1OC(=O)c2ccccc21 to produce COc1ccc2c(c1)CCC(N1C(=O)c3ccccc3C1=O)C2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.