Using CCOC(C)=O, CC(=O)OC(c1cn2c(n1)CN(C)C(=O)C2)C1(Br)C(=O)N2C(C(=O)OCc3ccc([N+](=O)[O-])cc3)=CS[C@@H]21 to produce CN1Cc2ncc(C=O)n2CC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.