Using COc1ccc(-c2c(C(=O)O)oc3cc(O)c(Cl)cc3c2=O)cc1, NN to produce COc1ccc(-c2c(-c3cc(Cl)c(O)cc3O)n[nH]c2C(=O)O)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.