Using Cc1nc(-c2cn3c(n2)-c2cc(Br)ccc2OCC3)n(C(C)C)n1, CB1OB(C)OB(C)O1 to produce Cc1ccc2c(c1)-c1nc(-c3nc(C)nn3C(C)C)cn1CCO2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.