Using CC(C)(C)OC(=O)[C@@H]1CCCN1C(=O)[C@@H]1CCCN1, CCCCCCCSC[C@H](N[C@@H](C)C(=O)O)C(=O)OCC to produce CCCCCCCSC[C@H](N[C@@H](C)C(=O)N1CCC[C@H]1C(=O)N1CCC[C@H]1C(=O)OC(C)(C)C)C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.