Using O=Cc1ccc(-c2ccc3nc(-c4ccc(Cl)cc4)cn3c2)o1 to produce OCc1ccc(-c2ccc3nc(-c4ccc(Cl)cc4)cn3c2)o1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.