Using C[C@H](NC(=O)OC(C)(C)C)C(=O)O, Cc1cn(C2O[C@H](CO)C(C)(O)[C@@]2(C)F)c(=O)[nH]c1=O to produce Cc1cn(C2O[C@H](COC(=O)[C@H](C)NC(=O)OC(C)(C)C)C(C)(O)[C@@]2(C)F)c(=O)[nH]c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.