Using O=C(O)COc1cccc(CCCN(CCC(c2ccccc2)c2ccccc2)C(=O)c2ccccc2)c1 to produce O=C([O-])COc1cccc(CCCN(CCC(c2ccccc2)c2ccccc2)C(=O)c2ccccc2)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.