Using CC(C)(C)OC(=O)N1CCC2(CC1)NC(=O)c1cc(Br)ccc1O2, C=CC(=O)OC to produce COC(=O)/C=C/c1ccc2c(c1)C(=O)NC1(CCN(C(=O)OC(C)(C)C)CC1)O2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.