Using CC(C)[C@@H]1CCc2ncnc(N3CC4(CCNCC4)c4c(CN(C(=O)OC(C)(C)C)C5CCCC5)cccc43)c21 to produce CC(C)[C@@H]1CCc2ncnc(N3CC4(CCNCC4)c4c(CNC5CCCC5)cccc43)c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.