(ZnC5NH3O5)2C2NH2 crystallizes in the triclinic P-1 space group. The structure consists of two n-methyl methanimine molecules inside a ZnC5NH3O5 framework. In the ZnC5NH3O5 framework, there are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one N(1), one O(5), one O(7), one O(9), and two equivalent O(1) atoms to form distorted edge-sharing ZnNO5 octahedra. The Zn(1)-N(1) bond length is 2.08 Å. The Zn(1)-O(5) bond length is 2.01 Å. The Zn(1)-O(7) bond length is 2.28 Å. The Zn(1)-O(9) bond length is 2.03 Å. There is one shorter (2.11 Å) and one longer (2.15 Å) Zn(1)-O(1) bond length. In the second Zn site, Zn(2) is bonded to one N(2), one O(10), one O(6), one O(8), and two equivalent O(2) atoms to form distorted edge-sharing ZnNO5 octahedra. The Zn(2)-N(2) bond length is 2.08 Å. The Zn(2)-O(10) bond length is 2.03 Å. The Zn(2)-O(6) bond length is 2.01 Å. The Zn(2)-O(8) bond length is 2.28 Å. There is one shorter (2.11 Å) and one longer (2.16 Å) Zn(2)-O(2) bond length. There are ten inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(1), and one O(3) atom. The C(1)-C(3) bond length is 1.49 Å. The C(1)-O(1) bond length is 1.30 Å. The C(1)-O(3) bond length is 1.24 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(2), and one O(4) atom. The C(2)-C(4) bond length is 1.49 Å. The C(2)-O(2) bond length is 1.30 Å. The C(2)-O(4) bond length is 1.25 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(1), one C(4), and one N(1) atom. The C(3)-C(4) bond length is 1.42 Å. The C(3)-N(1) bond length is 1.36 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(2), one C(3), and one N(2) atom. The C(4)-N(2) bond length is 1.36 Å. In the fifth C site, C(5) is bonded in a distorted water-like geometry to one C(6), one N(1), and one N(2) atom. The C(5)-C(6) bond length is 1.45 Å. The C(5)-N(1) bond length is 1.36 Å. The C(5)-N(2) bond length is 1.36 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(5), one C(7), and one C(8) atom. The C(6)-C(7) bond length is 1.41 Å. The C(6)-C(8) bond length is 1.41 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(6) and one H(1) atom. The C(7)-H(1) bond length is 1.09 Å. In the eighth C site, C(8) is bonded in a distorted single-bond geometry to one C(6) and one H(2) atom. The C(8)-H(2) bond length is 1.09 Å. In the ninth C site, C(11) is bonded in a bent 120 degrees geometry to one O(5) and one O(7) atom. The C(11)-O(5) bond length is 1.27 Å. The C(11)-O(7) bond length is 1.26 Å. In the tenth C site, C(12) is bonded in a bent 120 degrees geometry to one O(6) and one O(8) atom. The C(12)-O(6) bond length is 1.27 Å. The C(12)-O(8) bond length is 1.26 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one Zn(1), one C(3), and one C(5) atom. In the second N site, N(2) is bonded in a distorted trigonal planar geometry to one Zn(2), one C(4), and one C(5) atom. There are six inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(7) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(8) atom. In the third H site, H(5) is bonded in a distorted single-bond geometry to one O(3) and one O(9) atom. The H(5)-O(3) bond length is 1.70 Å. The H(5)-O(9) bond length is 1.00 Å. In the fourth H site, H(6) is bonded in a single-bond geometry to one O(10) and one O(4) atom. The H(6)-O(10) bond length is 1.00 Å. The H(6)-O(4) bond length is 1.71 Å. In the fifth H site, H(7) is bonded in a single-bond geometry to one O(9) atom. The H(7)-O(9) bond length is 0.98 Å. In the sixth H site, H(8) is bonded in a single-bond geometry to one O(10) atom. The H(8)-O(10) bond length is 0.98 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Zn(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Zn(2) and one C(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one C(1) and one H(5) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one C(2) and one H(6) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(11) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Zn(2) and one C(12) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Zn(1) and one C(11) atom. In the eighth O site, O(8) is bonded in a distorted water-like geometry to one Zn(2) and one C(12) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Zn(1), one H(5), and one H(7) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Zn(2), one H(6), and one H(8) atom. Linkers: 1 [O]C(=O)C([O])=O. Metal clusters: 4 [Zn]. The MOF has largest included sphere 1.88 A, density 2.12 g/cm3, surface area 3292.36 m2/g, accessible volume 0.08 cm3/g