Using CC(C)(NC(=O)CCS)C(=O)O, CCC[C@H](NC(=O)[C@H](CCCCNC(=O)OC(C)(C)C)NC(=O)C1CCCC1)C(=O)O to produce CCC[C@H](NC(=O)[C@H](CCCCNC(=O)OC(C)(C)C)NC(=O)C1CCCC1)C(=O)SCCC(=O)NC(C)(C)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.