Using NOS(=O)(=O)O, CCOC(=O)c1c(S)n(C2CC2)c2c(OC)c(Br)ccc2c1=O to produce COc1c(Br)ccc2c(=O)c3c(=O)[nH]sc3n(C3CC3)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.