(IV) \(\left.\mathrm{Pt}+\mathrm{Cl}_2(\mathrm{en})_2\right]\left(\mathrm{NO}_3\right)_2\) is dichlorido-bis-(ethane-1, 2-diamine)-platinum (IV) nitrate, when en \(\Rightarrow\) ethylenediamine is \(\mathrm{H}_2 \mathrm{~N}-\mathrm{l}_{\mathrm{C}}^{\mathrm{C}} \mathrm{H}_2-\stackrel{2}{\mathrm{C}} \mathrm{H}_2-\mathrm{NH}_2\) or ethane-1, 2-diamine (IUPAC).