Using CCCC(O)c1c(C)nn2c(-c3ccc(Cl)cc3Cl)c(C)oc12 to produce CCCC(=O)c1c(C)nn2c(-c3ccc(Cl)cc3Cl)c(C)oc12, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.