Using C=CCC1CC2(CCCC)Cc3cc(OCOC)ccc3C2=C(C)C1=O to produce C=CCC1CC2(CCCC)Cc3cc(O)ccc3C2=C(C)C1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.