Zn2C10NH5O6CH2O crystallizes in the monoclinic P2_1 space group. The structure consists of four formaldehyde molecules inside a Zn2C10NH5O6 framework. In the Zn2C10NH5O6 framework, there are four inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one N(1), one O(1), one O(10), one O(4), and one O(6) atom to form corner-sharing ZnNO4 trigonal bipyramids. The Zn(1)-N(1) bond length is 2.02 Å. The Zn(1)-O(1) bond length is 2.25 Å. The Zn(1)-O(10) bond length is 2.01 Å. The Zn(1)-O(4) bond length is 2.08 Å. The Zn(1)-O(6) bond length is 1.98 Å. In the second Zn site, Zn(2) is bonded to one N(2), one O(1), one O(5), and one O(9) atom to form distorted corner-sharing ZnNO3 trigonal pyramids. The Zn(2)-N(2) bond length is 1.96 Å. The Zn(2)-O(1) bond length is 2.09 Å. The Zn(2)-O(5) bond length is 1.96 Å. The Zn(2)-O(9) bond length is 1.99 Å. In the third Zn site, Zn(3) is bonded to one N(2), one O(11), one O(2), one O(3), and one O(7) atom to form corner-sharing ZnNO4 trigonal bipyramids. The Zn(3)-N(2) bond length is 2.03 Å. The Zn(3)-O(11) bond length is 1.98 Å. The Zn(3)-O(2) bond length is 2.08 Å. The Zn(3)-O(3) bond length is 2.25 Å. The Zn(3)-O(7) bond length is 2.01 Å. In the fourth Zn site, Zn(4) is bonded to one N(1), one O(12), one O(3), and one O(8) atom to form corner-sharing ZnNO3 trigonal pyramids. The Zn(4)-N(1) bond length is 1.96 Å. The Zn(4)-O(12) bond length is 1.96 Å. The Zn(4)-O(3) bond length is 2.09 Å. The Zn(4)-O(8) bond length is 1.99 Å. There are twenty inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(1)-O(1) bond length is 1.28 Å. The C(1)-O(2) bond length is 1.26 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one N(1) and one H(1) atom. The C(2)-N(1) bond length is 1.27 Å. The C(2)-H(1) bond length is 1.10 Å. In the third C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(4) atom. The C(4)-O(3) bond length is 1.28 Å. The C(4)-O(4) bond length is 1.26 Å. In the fourth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one N(2) and one H(4) atom. The C(5)-N(2) bond length is 1.27 Å. The C(5)-H(4) bond length is 1.10 Å. In the fifth C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(8), one O(5), and one O(6) atom. The C(7)-C(8) bond length is 1.50 Å. The C(7)-O(5) bond length is 1.28 Å. The C(7)-O(6) bond length is 1.27 Å. In the sixth C site, C(8) is bonded in a trigonal planar geometry to one C(13), one C(7), and one C(9) atom. The C(8)-C(13) bond length is 1.40 Å. The C(8)-C(9) bond length is 1.40 Å. In the seventh C site, C(9) is bonded in a distorted trigonal planar geometry to one C(10), one C(8), and one H(7) atom. The C(9)-C(10) bond length is 1.39 Å. The C(9)-H(7) bond length is 1.09 Å. In the eighth C site, C(10) is bonded in a distorted single-bond geometry to one C(11), one C(9), and one H(8) atom. The C(10)-C(11) bond length is 1.40 Å. The C(10)-H(8) bond length is 1.09 Å. In the ninth C site, C(11) is bonded in a trigonal planar geometry to one C(10), one C(12), and one C(14) atom. The C(11)-C(12) bond length is 1.40 Å. The C(11)-C(14) bond length is 1.50 Å. In the tenth C site, C(12) is bonded in a distorted single-bond geometry to one C(11), one C(13), and one H(9) atom. The C(12)-C(13) bond length is 1.39 Å. The C(12)-H(9) bond length is 1.09 Å. In the eleventh C site, C(13) is bonded in a distorted trigonal planar geometry to one C(12), one C(8), and one H(10) atom. The C(13)-H(10) bond length is 1.09 Å. In the twelfth C site, C(14) is bonded in a distorted bent 120 degrees geometry to one C(11), one O(7), and one O(8) atom. The C(14)-O(7) bond length is 1.27 Å. The C(14)-O(8) bond length is 1.28 Å. In the thirteenth C site, C(15) is bonded in a distorted bent 120 degrees geometry to one C(22), one O(10), and one O(9) atom. The C(15)-C(22) bond length is 1.50 Å. The C(15)-O(10) bond length is 1.27 Å. The C(15)-O(9) bond length is 1.28 Å. In the fourteenth C site, C(16) is bonded in a distorted trigonal planar geometry to one C(17), one C(21), and one H(11) atom. The C(16)-C(17) bond length is 1.40 Å. The C(16)-C(21) bond length is 1.39 Å. The C(16)-H(11) bond length is 1.09 Å. In the fifteenth C site, C(17) is bonded in a trigonal planar geometry to one C(16), one C(18), and one C(20) atom. The C(17)-C(18) bond length is 1.40 Å. The C(17)-C(20) bond length is 1.50 Å. In the sixteenth C site, C(18) is bonded in a distorted trigonal planar geometry to one C(17), one C(19), and one H(12) atom. The C(18)-C(19) bond length is 1.39 Å. The C(18)-H(12) bond length is 1.09 Å. In the seventeenth C site, C(19) is bonded in a distorted single-bond geometry to one C(18), one C(22), and one H(13) atom. The C(19)-C(22) bond length is 1.40 Å. The C(19)-H(13) bond length is 1.09 Å. In the eighteenth C site, C(20) is bonded in a distorted bent 120 degrees geometry to one C(17), one O(11), and one O(12) atom. The C(20)-O(11) bond length is 1.27 Å. The C(20)-O(12) bond length is 1.28 Å. In the nineteenth C site, C(21) is bonded in a single-bond geometry to one C(16), one C(22), and one H(14) atom. The C(21)-C(22) bond length is 1.40 Å. The C(21)-H(14) bond length is 1.09 Å. In the twentieth C site, C(22) is bonded in a trigonal planar geometry to one C(15), one C(19), and one C(21) atom. There are two inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one Zn(1), one Zn(4), and one C(2) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one Zn(2), one Zn(3), and one C(5) atom. There are ten inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(2) atom. In the second H site, H(4) is bonded in a single-bond geometry to one C(5) atom. In the third H site, H(7) is bonded in a single-bond geometry to one C(9) atom. In the fourth H site, H(8) is bonded in a single-bond geometry to one C(10) atom. In the fifth H site, H(9) is bonded in a single-bond geometry to one C(12) atom. In the sixth H site, H(10) is bonded in a single-bond geometry to one C(13) atom. In the seventh H site, H(11) is bonded in a single-bond geometry to one C(16) atom. In the eighth H site, H(12) is bonded in a single-bond geometry to one C(18) atom. In the ninth H site, H(13) is bonded in a single-bond geometry to one C(19) atom. In the tenth H site, H(14) is bonded in a single-bond geometry to one C(21) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Zn(1), one Zn(2), and one C(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(3) and one C(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Zn(3), one Zn(4), and one C(4) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(4) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Zn(2) and one C(7) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Zn(1) and one C(7) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Zn(3) and one C(14) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Zn(4) and one C(14) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Zn(2) and one C(15) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one Zn(1) and one C(15) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Zn(3) and one C(20) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Zn(4) and one C(20) atom. Linkers: 4 [N]=CC([O])=O ,4 [O]C(=O)c1ccc(C([O])=O)cc1. Metal clusters: 8 [Zn]. The MOF has largest included sphere 5.43 A, density 0.97 g/cm3, surface area 3892.52 m2/g, accessible volume 0.68 cm3/g