Using CCOC(=O)C1(c2cccc(Br)c2)CC1, C=CC(=O)OCC to produce CCOC(=O)/C=C/c1cccc(C2(C(=O)OCC)CC2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.