ZnC9H3O4 crystallizes in the trigonal R-3m space group. Zn(1) is bonded in a distorted square co-planar geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Zn(1)-O(1) bond lengths are 2.04 Å. Both Zn(1)-O(2) bond lengths are 2.04 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded in a bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(1)-C(2) bond length is 1.50 Å. The C(1)-O(1) bond length is 1.23 Å. The C(1)-O(2) bond length is 1.26 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(6) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-C(6) bond length is 1.39 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one H(1) atom. The C(3)-C(4) bond length is 1.38 Å. The C(3)-H(1) bond length is 0.93 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(5) and two equivalent C(3) atoms. The C(4)-C(5) bond length is 1.47 Å. In the fifth C site, C(5) is bonded in a linear geometry to one C(4) and one C(5) atom. The C(5)-C(5) bond length is 1.15 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to two equivalent C(2) and one H(2) atom. The C(6)-H(2) bond length is 0.93 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(6) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Zn(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Zn(1) and one C(1) atom. Linkers: 3 [O]C(=O)c1cc(C#Cc2cc(C([O])=O)cc(C([O])=O)c2)cc(C([O])=O)c1. Metal clusters: 3 [C]1O[Zn]23O[C]O[Zn](O1)(O[C]O2)O[C]O3. RCSR code: nbo. The MOF has largest included sphere 11.08 A, density 0.71 g/cm3, surface area 3690.20 m2/g, accessible volume 1.09 cm3/g