(Er2C3H2O8)2(CH2)6(CNH4)3 is Indium-derived structured and crystallizes in the orthorhombic P2_12_12_1 space group. The structure is zero-dimensional and consists of twenty-four 02329_fluka molecules, twelve methylammonium molecules, and four Er2C3H2O8 clusters. In each Er2C3H2O8 cluster, there are four inequivalent Er sites. In the first Er site, Er(1) is bonded to one O(1), one O(16), one O(2), one O(4), one O(7), and one O(9) atom to form distorted edge-sharing ErO6 pentagonal pyramids. The Er(1)-O(1) bond length is 2.35 Å. The Er(1)-O(16) bond length is 2.33 Å. The Er(1)-O(2) bond length is 2.38 Å. The Er(1)-O(4) bond length is 2.30 Å. The Er(1)-O(7) bond length is 2.29 Å. The Er(1)-O(9) bond length is 2.35 Å. In the second Er site, Er(2) is bonded to one O(10), one O(11), one O(2), one O(3), one O(4), and one O(6) atom to form distorted edge-sharing ErO6 pentagonal pyramids. The Er(2)-O(10) bond length is 2.31 Å. The Er(2)-O(11) bond length is 2.30 Å. The Er(2)-O(2) bond length is 2.39 Å. The Er(2)-O(3) bond length is 2.38 Å. The Er(2)-O(4) bond length is 2.31 Å. The Er(2)-O(6) bond length is 2.32 Å. In the third Er site, Er(3) is bonded to one O(1), one O(13), one O(2), one O(3), one O(5), and one O(8) atom to form distorted edge-sharing ErO6 pentagonal pyramids. The Er(3)-O(1) bond length is 2.31 Å. The Er(3)-O(13) bond length is 2.31 Å. The Er(3)-O(2) bond length is 2.31 Å. The Er(3)-O(3) bond length is 2.32 Å. The Er(3)-O(5) bond length is 2.30 Å. The Er(3)-O(8) bond length is 2.32 Å. In the fourth Er site, Er(4) is bonded to one O(1), one O(12), one O(14), one O(15), one O(3), and one O(4) atom to form distorted edge-sharing ErO6 pentagonal pyramids. The Er(4)-O(1) bond length is 2.36 Å. The Er(4)-O(12) bond length is 2.31 Å. The Er(4)-O(14) bond length is 2.29 Å. The Er(4)-O(15) bond length is 2.33 Å. The Er(4)-O(3) bond length is 2.33 Å. The Er(4)-O(4) bond length is 2.33 Å. There are six inequivalent C sites. In the first C site, C(5) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(8) atom. The C(5)-O(7) bond length is 1.22 Å. The C(5)-O(8) bond length is 1.25 Å. In the second C site, C(6) is bonded in a distorted bent 120 degrees geometry to one O(10) and one O(9) atom. The C(6)-O(10) bond length is 1.23 Å. The C(6)-O(9) bond length is 1.25 Å. In the third C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. The C(1)-O(5) bond length is 1.23 Å. The C(1)-O(6) bond length is 1.27 Å. In the fourth C site, C(10) is bonded in a distorted bent 120 degrees geometry to one O(11) and one O(12) atom. The C(10)-O(11) bond length is 1.24 Å. The C(10)-O(12) bond length is 1.26 Å. In the fifth C site, C(11) is bonded in a distorted bent 120 degrees geometry to one O(13) and one O(14) atom. The C(11)-O(13) bond length is 1.25 Å. The C(11)-O(14) bond length is 1.26 Å. In the sixth C site, C(15) is bonded in a distorted trigonal planar geometry to one O(15) and one O(16) atom. The C(15)-O(15) bond length is 1.25 Å. The C(15)-O(16) bond length is 1.28 Å. There are four 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(2) atom. The H(2)-O(2) bond length is 1.00 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(3) atom. The H(3)-O(3) bond length is 1.00 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(4) atom. The H(4)-O(4) bond length is 1.00 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Er(1), one Er(3), one Er(4), and one H(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Er(1), one Er(2), one Er(3), and one H(2) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Er(2), one Er(3), one Er(4), and one H(3) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Er(1), one Er(2), one Er(4), and one H(4) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Er(3) and one C(1) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Er(2) and one C(1) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Er(1) and one C(5) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Er(3) and one C(5) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Er(1) and one C(6) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Er(2) and one C(6) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one Er(2) and one C(10) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one Er(4) and one C(10) atom. In the thirteenth O site, O(13) is bonded in a 2-coordinate geometry to one Er(3) and one C(11) atom. In the fourteenth O site, O(14) is bonded in a distorted single-bond geometry to one Er(4) and one C(11) atom. In the fifteenth O site, O(15) is bonded in a distorted single-bond geometry to one Er(4) and one C(15) atom. In the sixteenth O site, O(16) is bonded in a distorted single-bond geometry to one Er(1) and one C(15) atom. Linkers: 12 [O]C(=O)CC[C@@H](C(=O)[O])[NH3]. Metal clusters: 4 O[Er]12O[C]O[Er]3O[C]O[Er](O[C]O1)O[C]O[Er](O)(O)(O)(O[C]O3)O[C]O2. RCSR code: acs. The MOF has largest included sphere 6.37 A, density 1.46 g/cm3, surface area 2504.14 m2/g, accessible volume 0.41 cm3/g