Using O=Cc1[nH]cc2c1CN=C(c1ccccc1Cl)c1cc(Cl)ccc1-2, CO to produce Cc1[nH]c(CO)c2c1-c1ccc(Cl)cc1C(c1ccccc1Cl)=NC2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.