Using CC(C)(C)OC(=O)NC(CCn1c(Sc2cc3c(cc2Br)OCO3)nc2c(N)ncnc21)C1CCC1 to produce Nc1ncnc2c1nc(Sc1cc3c(cc1Br)OCO3)n2CCC(N)C1CCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.