Using OC(Cn1c(-c2ccc(Cl)cc2)nc2cccnc21)c1ccccc1 to produce O=C(Cn1c(-c2ccc(Cl)cc2)nc2cccnc21)c1ccccc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.