Using C=Cc1ccccc1, CCC1(CCO)OCCc2c1[nH]c1c(Br)cc(C(C)C)cc21 to produce CCC1(CCO)OCCc2c1[nH]c1c(C=Cc3ccccc3)cc(C(C)C)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.