Using CCOC(=O)c1c(O)nc2cc(Cl)c(Cl)cc2c1CN=[N+]=[N-], CO to produce O=C1NC(=O)c2c1c(O)nc1cc(Cl)c(Cl)cc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.