Using CCOC(=O)CCCCCCCC1Cc2c(c(OC)c(OC)c(OC)c2OC)C1 to produce CCOC(=O)CCCCCCCC1CC2=C(C1)C(=O)C(OC)=C(OC)C2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.