Using CC1CN(c2c(F)cc3c(=O)c(C(=O)O)cn(C4CC4)c3c2F)CC1NC(=O)OC(C)(C)C to produce CC1CN(c2c(F)cc3c(=O)c(C(=O)O)cn(C4CC4)c3c2F)CC1N, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.