ZnC4NH6O7 crystallizes in the triclinic P-1 space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both Zn(1)-O(1) bond lengths are 2.16 Å. Both Zn(1)-O(2) bond lengths are 2.08 Å. Both Zn(1)-O(3) bond lengths are 2.14 Å. In the second Zn site, Zn(2) is bonded in an octahedral geometry to two equivalent N(1), two equivalent O(4), and two equivalent O(5) atoms. Both Zn(2)-N(1) bond lengths are 2.20 Å. Both Zn(2)-O(4) bond lengths are 2.09 Å. Both Zn(2)-O(5) bond lengths are 2.09 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(2), and one O(4) atom. The C(1)-C(2) bond length is 1.51 Å. The C(1)-O(2) bond length is 1.27 Å. The C(1)-O(4) bond length is 1.26 Å. In the second C site, C(2) is bonded in a distorted trigonal planar geometry to one C(1), one C(3), and one N(1) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-N(1) bond length is 1.34 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one C(4), and one N(1) atom. The C(3)-C(4) bond length is 1.52 Å. The C(3)-N(1) bond length is 1.34 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(6), and one O(7) atom. The C(4)-O(6) bond length is 1.27 Å. The C(4)-O(7) bond length is 1.26 Å. N(1) is bonded in a trigonal planar geometry to one Zn(2), one C(2), and one C(3) atom. There are six inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) atom. The H(1)-O(1) bond length is 1.00 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(1) atom. The H(2)-O(1) bond length is 1.00 Å. In the third H site, H(3) is bonded in a linear geometry to one O(3) and one O(7) atom. The H(3)-O(3) bond length is 1.01 Å. The H(3)-O(7) bond length is 1.63 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(3) atom. The H(4)-O(3) bond length is 0.98 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(5) and one O(7) atom. The H(5)-O(5) bond length is 0.99 Å. The H(5)-O(7) bond length is 1.74 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(5) atom. The H(6)-O(5) bond length is 1.00 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted water-like geometry to one Zn(1), one H(1), and one H(2) 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. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Zn(1), one H(3), and one H(4) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Zn(2) and one C(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Zn(2), one H(5), and one H(6) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one C(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one C(4), one H(3), and one H(5) atom. Linkers: 1 [O]C(=O)c1nc(C([O])=O)c(C([O])=O)nc1C([O])=O. Metal clusters: 2 [Zn]. The MOF has largest included sphere 2.05 A, density 2.22 g/cm3, surface area 3037.74 m2/g, accessible volume 0.09 cm3/g