Using CCCCCCCCCCCC(O)c1c(O)c(Cl)c(C)c(C=O)c1O to produce CCCCCCCCCCC=Cc1c(O)c(Cl)c(C)c(C=O)c1O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.