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