Using CCCS(=O)(=O)Oc1c(-c2ccc3c(c2C)C(=NOC)CC(=C=O)S3(=O)=O)cnn1CC, CCBr to produce CON=C1CCSc2ccc(Br)c(C)c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.