Mg3C30N15H6O37(C4NH2)3 is Indium-derived structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is zero-dimensional and consists of two C4NH2 clusters and two Mg3C30N15H6O37 clusters. In each C4NH2 cluster, there are three inequivalent C sites. In the first C site, C(2) is bonded in a trigonal planar geometry to one C(3) and two equivalent C(6) atoms. The C(2)-C(3) bond length is 1.50 Å. Both C(2)-C(6) bond lengths are 1.37 Å. In the second C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2) and two equivalent N(3) atoms. Both C(3)-N(3) bond lengths are 1.34 Å. In the third C site, C(6) is bonded in a distorted single-bond geometry to one C(2) and one H(1) atom. The C(6)-H(1) bond length is 0.93 Å. N(3) is bonded in a bent 120 degrees geometry to two equivalent C(3) atoms. H(1) is bonded in a single-bond geometry to one C(6) atom. In each Mg3C30N15H6O37 cluster, Mg(1) is bonded to one N(2), one O(4), and four equivalent O(1) atoms to form corner-sharing MgNO5 octahedra. The corner-sharing octahedral tilt angles are 60°. The Mg(1)-N(2) bond length is 2.24 Å. The Mg(1)-O(4) bond length is 1.96 Å. All Mg(1)-O(1) bond lengths are 2.00 Å. There are four inequivalent C sites. In the first C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(5) and two equivalent O(1) atoms. The C(4)-C(5) bond length is 1.51 Å. Both C(4)-O(1) bond lengths are 1.24 Å. In the second C site, C(5) is bonded in a trigonal planar geometry to one C(4) and two equivalent C(1) atoms. Both C(5)-C(1) bond lengths are 1.32 Å. In the third C site, C(7) is bonded in a 2-coordinate geometry to one N(2) and one H(2) atom. The C(7)-N(2) bond length is 1.32 Å. The C(7)-H(2) bond length is 0.93 Å. In the fourth C site, C(1) is bonded in a distorted single-bond geometry to one C(5) and one N(1) atom. The C(1)-N(1) bond length is 1.48 Å. There are two inequivalent N sites. In the first N site, N(2) is bonded in a trigonal planar geometry to one Mg(1) and two equivalent C(7) atoms. In the second N site, N(1) is bonded in a trigonal planar geometry to one C(1), one O(2), and one O(3) atom. The N(1)-O(2) bond length is 1.23 Å. The N(1)-O(3) bond length is 1.21 Å. H(2) is bonded in a single-bond geometry to one C(7) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Mg(1) and one C(4) atom. In the second O site, O(2) is bonded in a single-bond geometry to one N(1) atom. In the third O site, O(3) is bonded in a single-bond geometry to one N(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to three equivalent Mg(1) atoms. Linkers: 4 n1ccc(cc1)C1=NC(=[N]=C([N]1)c1ccncc1)c1ccncc1 ,6 [O]C(=O)c1c([N+](=O)[O-])c([N+](=O)[O-])c(C([O])=O)c([N+](=O)[O-])c1[N+](=O)[O-]. Metal clusters: 1 O=[C]O[Mg]O[Mg]O[C]O[Mg].[O][C]=O.[O][C]=O.[O][C]=O.[O][C]=O ,1 O=[C]O[Mg].O=[C]O[Mg]O[Mg]O[C]=O.[O][C]=O.[O][C]=O.[O][C]=O. RCSR code: acs. The MOF has largest included sphere 7.76 A, density 1.31 g/cm3, surface area 3198.67 m2/g, accessible volume 0.39 cm3/g