The complex consists of a heterotetranuclear
(Cu2Ni2)
macrocyclic base with "superstructure" involving two further nickel ions
and the 2,6-diformyl-4-methylphenolate (dfmp) anion. Acetate anions bridge
the Ni(II) ions on the top and bottom faces.
It is probably easier to see if you
check the spin molecule box.
Alternately, left-click on the picture
and manipulate it yourself.
(Right-click on the picture
to see available Jmol commands for manipulating the molecule)
The Ni(II) ions are shown in green,
Cu(II) ions in orange.