Using O=P([O-])([O-])O, COc1cc(OC)nc(Oc2c(Cl)cccc2C=O)n1 to produce COc1cc(OC)nc(Oc2c(Cl)cccc2C(=O)O)n1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.