Using O=C(O)C1(O)CN(C(c2ccccc2)c2ccccc2)C1, CO to produce COC(=O)C1(O)CN(C(c2ccccc2)c2ccccc2)C1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.