Zn2C2N3H3O crystallizes in the orthorhombic Pnma space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a bent 150 degrees geometry to one N(2) and one O(1) atom. The Zn(1)-N(2) bond length is 1.97 Å. The Zn(1)-O(1) bond length is 1.98 Å. In the second Zn site, Zn(2) is bonded in a square co-planar geometry to two equivalent N(1) and two equivalent O(1) atoms. Both Zn(2)-N(1) bond lengths are 2.08 Å. Both Zn(2)-O(1) bond lengths are 2.05 Å. C(1) is bonded in a trigonal planar geometry to one N(1), one N(2), and one H(1) atom. The C(1)-N(1) bond length is 1.32 Å. The C(1)-N(2) bond length is 1.35 Å. The C(1)-H(1) bond length is 0.95 Å. There are two inequivalent N sites. In the first N site, N(2) is bonded in a trigonal planar geometry to one Zn(1) and two equivalent C(1) atoms. In the second N site, N(1) is bonded in a 3-coordinate geometry to one Zn(2), one C(1), and one N(1) atom. The N(1)-N(1) bond length is 1.38 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. 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 0.73 Å. O(1) is bonded in a distorted single-bond geometry to one Zn(1), two equivalent Zn(2), and one H(2) atom. Linkers: 4 C1=NN=C[N]1. Metal clusters: 8 [Zn]. The MOF has largest included sphere 3.81 A, density 2.09 g/cm3, surface area 2796.05 m2/g, accessible volume 0.21 cm3/g