Using OC1CCCC1, CSCC[C@H](NC(=O)OC(C)(C)C)C(=O)O to produce CSCC[C@H](NC(=O)OC(C)(C)C)C(=O)OC1CCCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.