Using CC1(CC2Cc3c(-c4ccccc4-c4ccccc4)cccc3C2O)CCCCC1 to produce CC1(CC2=Cc3cccc(-c4ccccc4-c4ccccc4)c3C2)CCCCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.