Using SCCCS, CCCCC(C=O)NC(=O)[C@H](CC(C)C)NC(=O)OCc1ccccc1 to produce CCCCC(NC(=O)[C@H](CC(C)C)NC(=O)OCc1ccccc1)C1SCCCS1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.