MgZn(C3O2)3 crystallizes in the cubic P2_13 space group. Mg(1) is bonded in a distorted T-shaped geometry to three equivalent O(1) atoms. All Mg(1)-O(1) bond lengths are 2.01 Å. Zn(1) is bonded in a trigonal non-coplanar geometry to three equivalent O(2) atoms. All Zn(1)-O(2) bond lengths are 1.94 Å. There are three inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(3) and two equivalent C(2) atoms. The C(1)-C(3) bond length is 1.55 Å. There is one shorter (1.31 Å) and one longer (1.50 Å) C(1)-C(2) bond length. In the second C site, C(2) is bonded in a bent 120 degrees geometry to two equivalent C(1) atoms. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(1), and one O(2) atom. The C(3)-O(1) bond length is 1.15 Å. The C(3)-O(2) bond length is 1.33 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Mg(1) and one C(3) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Zn(1) and one C(3) atom. Linkers: 4 [O]C(=O)c1[c]c(C([O])=O)[c]c(C([O])=O)[c]1. Metal clusters: 4 O=[C]O[Zn]1O[C]O[Mg]O[C]O1. RCSR code: srs. The MOF has largest included sphere 8.87 A, density 0.66 g/cm3, surface area 3882.24 m2/g, accessible volume 1.16 cm3/g