Using COC(=O)[C@@H](Cc1cc(C)c(N)c(C)c1)OC(=O)N1CCC(N2CCc3ccccc3NC2=O)CC1 to produce Cc1cc(C[C@@H](OC(=O)N2CCC(N3CCc4ccccc4NC3=O)CC2)C(=O)O)cc(C)c1N, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.