Using CC(C)Cc1cc2c(c(C(F)(F)F)c1)C(=O)N1CCN(C(=O)OC(C)(C)C)C[C@@H]21 to produce CC(C)Cc1cc2c(c(C(F)(F)F)c1)C(=O)N1CCNC[C@@H]21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.