Scroll down to paragraph 2 with name "3D Conformer".
Under the text "3D Conformer of Parent Compound Adenosine Triphosphate (CID 5957)" (that give you hint where from this conformer was taken) - you will see 3 buttons with very promising names and pictograms. Magnesium has to be added manually, anyway location of this ion is pretty random.
If your software unable to open any of 4 formats they suggest you to, you can manually edit for examole SDF to XYZ, it take approx 1 minute.