Using CC(O)Br, Cn1cc(-c2cnc3nnn(C[C@@H]4CN(c5ncc(C6=CCNCC6)cn5)CCO4)c3n2)cn1 to produce Cn1cc(-c2cnc3nnn(C[C@@H]4CN(c5ncc(C6=CCN(CCO)CC6)cn5)CCO4)c3n2)cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.