Using CC(=O)OC1CCN(c2cc(C)c3nncn3n2)CC1[Se]c1ccccc1 to produce Cc1cc(N2CCC(O)C([Se]c3ccccc3)C2)nn2cnnc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.