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