Using COC(=O)[C@@H](Cc1cc(C)c2[nH]ncc2c1)NC(=O)N1CCC(N2Cc3ccccc3NC2=O)CC1 to produce Cc1cc(C[C@@H](NC(=O)N2CCC(N3Cc4ccccc4NC3=O)CC2)C(=O)O)cc2cn[nH]c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.