Using CCOC1=CCCc2cnc(-c3ccc(N4CCOCC4)c(Cl)c3)nc21 to produce O=C1CCCc2cnc(-c3ccc(N4CCOCC4)c(Cl)c3)nc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.