ZnC8NH5O4 crystallizes in the monoclinic C2/c space group. Zn(1) is bonded in a 5-coordinate geometry to one N(1), one O(1), one O(2), one O(3), and one O(4) atom. The Zn(1)-N(1) bond length is 2.07 Å. The Zn(1)-O(1) bond length is 2.03 Å. The Zn(1)-O(2) bond length is 2.01 Å. The Zn(1)-O(3) bond length is 2.50 Å. The Zn(1)-O(4) bond length is 2.00 Å. There are eight inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(2), one C(6), and one C(7) atom. The C(1)-C(2) bond length is 1.41 Å. The C(1)-C(6) bond length is 1.39 Å. The C(1)-C(7) bond length is 1.50 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(8) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-C(8) bond length is 1.49 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2) and one H(3) atom. The C(3)-H(3) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(5) and one H(4) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-H(4) bond length is 1.09 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one C(6), and one N(1) atom. The C(5)-C(6) bond length is 1.40 Å. The C(5)-N(1) bond length is 1.44 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(1), one C(5), and one H(5) atom. The C(6)-H(5) bond length is 1.09 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(3), and one O(4) atom. The C(7)-O(3) bond length is 1.26 Å. The C(7)-O(4) bond length is 1.29 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(8)-O(1) bond length is 1.27 Å. The C(8)-O(2) bond length is 1.29 Å. N(1) is bonded in a distorted tetrahedral geometry to one Zn(1), one C(5), one H(1), and one H(2) atom. The N(1)-H(1) bond length is 1.02 Å. The N(1)-H(2) bond length is 1.04 Å. There are five inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one N(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one N(1) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(3) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(4) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(6) atom. There are four inequivalent O sites. In the first O site, O(3) is bonded in a single-bond geometry to one Zn(1) and one C(7) atom. In the second O site, O(4) is bonded in a water-like geometry to one Zn(1) and one C(7) atom. In the third O site, O(1) is bonded in a bent 150 degrees geometry to one Zn(1) and one C(8) atom. In the fourth O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(8) atom. Linkers: 4 Nc1ccc(C([O])=O)c(C([O])=O)c1. Metal clusters: 4 [Zn]. RCSR code: umc. The MOF has largest included sphere 2.50 A, density 1.95 g/cm3, surface area 3659.46 m2/g, accessible volume 0.12 cm3/g