Using C=CB1OC(C)(C)C(C)(C)O1, CC(C)(C)OC(=O)N1CCOc2c(Br)cccc2C1 to produce C=Cc1cccc2c1OCCN(C(=O)OC(C)(C)C)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.