Using Cc1c(C(=O)CBr)ccc2c1COC2=O, CC(C)(C)OC(=O)N1CCNC(=O)C1 to produce Cc1c(C(=O)CN2CCN(C(=O)OC(C)(C)C)CC2=O)ccc2c1COC2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.