Using CCOC(=O)CC[C@H](NC(=O)c1ccc(N)cc1)C(=O)OCC, Cc1nc2cc3c(cc2c(=O)n1COC(=O)C(C)(C)C)C(Br)CC3 to produce CCOC(=O)CC[C@H](NC(=O)c1ccc(NC2CCc3cc4nc(C)n(COC(=O)C(C)(C)C)c(=O)c4cc32)cc1)C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.