Using O=c1oc(CBr)c(-c2ccccc2)c2ccccc12, Sc1ncnc2[nH]cnc12 to produce O=c1oc(CSc2ncnc3[nH]cnc23)c(-c2ccccc2)c2ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.