Using O=C(OCc1ccccc1)N1CCC(CCI)CC1, N[C@@H](CS)C(=O)O to produce N[C@@H](CSCCC1CCN(C(=O)OCc2ccccc2)CC1)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.