Using C[C@H](NC(=O)CCc1ccc(-c2ccc(CCN3CCC[C@H]3C)cc2)cc1)C(=O)OC(C)(C)C to produce C[C@H](NC(=O)CCc1ccc(-c2ccc(CCN3CCC[C@H]3C)cc2)cc1)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.