ZnC5N4H3O2Cl crystallizes in the trigonal R-3 space group. Zn(1) is bonded in a distorted trigonal bipyramidal geometry to one N(1), one N(2), one N(4), one O(1), and one O(2) atom. The Zn(1)-N(1) bond length is 2.19 Å. The Zn(1)-N(2) bond length is 2.08 Å. The Zn(1)-N(4) bond length is 1.99 Å. The Zn(1)-O(1) bond length is 2.17 Å. The Zn(1)-O(2) bond length is 2.02 Å. There are five inequivalent C sites. In the first C site, C(5) is bonded in a distorted bent 120 degrees geometry to one N(4) and one O(2) atom. The C(5)-N(4) bond length is 1.31 Å. The C(5)-O(2) bond length is 1.30 Å. In the second C site, C(1) is bonded in a trigonal planar geometry to one N(1), one N(2), and one Cl(1) atom. The C(1)-N(1) bond length is 1.35 Å. The C(1)-N(2) bond length is 1.34 Å. The C(1)-Cl(1) bond length is 1.70 Å. In the third C site, C(2) is bonded in a distorted trigonal planar geometry to one C(3), one N(3), and one O(1) atom. The C(2)-C(3) bond length is 1.47 Å. The C(2)-N(3) bond length is 1.33 Å. The C(2)-O(1) bond length is 1.28 Å. In the fourth C site, C(3) is bonded in a distorted single-bond geometry to one C(2) and one N(2) atom. The C(3)-N(2) bond length is 1.38 Å. In the fifth C site, C(4) is bonded in a distorted single-bond geometry to one N(1) atom. The C(4)-N(1) bond length is 1.38 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded in a 3-coordinate geometry to one Zn(1), one C(1), and one C(4) atom. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Zn(1), one C(1), and one C(3) atom. In the third N site, N(3) is bonded in a trigonal planar geometry to one C(2), one H(1), and one H(2) atom. The N(3)-H(1) bond length is 1.03 Å. The N(3)-H(2) bond length is 1.03 Å. In the fourth N site, N(4) is bonded in a trigonal planar geometry to one Zn(1), one C(5), and one H(3) atom. The N(4)-H(3) bond length is 1.02 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one N(3) atom. In the second H site, H(2) is bonded in a single-bond geometry to one N(3) atom. In the third H site, H(3) is bonded in a single-bond geometry to one N(4) atom. There are two inequivalent O sites. In the first O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(5) atom. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(2) atom. Cl(1) is bonded in a single-bond geometry to one C(1) atom. Linkers: 1 [NH]C(=O)C1=C(C(N)=O)N=C(Cl)[N]1 ,5 [NH]C(=O)[C]1N=C(Cl)N=C1C(N)=O. Metal clusters: 6 [Zn]. The MOF has largest included sphere 7.84 A, density 1.44 g/cm3, surface area 3251.53 m2/g, accessible volume 0.40 cm3/g