Using O=C(NCCCBr)C1CC1, Nc1ncnc2[nH]c(Sc3cc4c(cc3I)CCO4)nc12 to produce Nc1ncnc2c1nc(Sc1cc3c(cc1I)CCO3)n2CCCNC(=O)C1CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.