ZnC27NH4O4 crystallizes in the orthorhombic Cccm space group. Zn(1) is bonded in a distorted square pyramidal geometry to one N(1), two equivalent O(1), and two equivalent O(2) atoms. The Zn(1)-N(1) bond length is 2.03 Å. Both Zn(1)-O(1) bond lengths are 2.02 Å. Both Zn(1)-O(2) bond lengths are 2.03 Å. There are fourteen inequivalent C sites. In the first C site, C(14) is bonded in a 7-coordinate geometry to one C(14), two equivalent C(12), two equivalent C(13), and two equivalent C(5) atoms. The C(14)-C(14) bond length is 1.48 Å. Both C(14)-C(12) bond lengths are 1.40 Å. Both C(14)-C(13) bond lengths are 1.39 Å. Both C(14)-C(5) bond lengths are 1.41 Å. In the second C site, C(1) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(9) atom. The C(1)-C(1) bond length is 1.50 Å. The C(1)-C(3) bond length is 1.39 Å. The C(1)-C(9) bond length is 1.41 Å. In the third C site, C(2) is bonded in a distorted single-bond geometry to one C(3), one C(7), and one H(1) atom. The C(2)-C(3) bond length is 1.34 Å. The C(2)-C(7) bond length is 1.35 Å. The C(2)-H(1) bond length is 0.93 Å. In the fourth C site, C(3) is bonded in a bent 120 degrees geometry to one C(1) and one C(2) atom. In the fifth C site, C(4) is bonded in a 4-coordinate geometry to one C(10), one C(11), one C(5), and one N(1) atom. The C(4)-C(10) bond length is 1.12 Å. The C(4)-C(11) bond length is 1.16 Å. The C(4)-C(5) bond length is 1.37 Å. The C(4)-N(1) bond length is 1.34 Å. In the sixth C site, C(5) is bonded in a 4-coordinate geometry to one C(12), one C(13), one C(14), and one C(4) atom. The C(5)-C(12) bond length is 1.23 Å. The C(5)-C(13) bond length is 1.18 Å. In the seventh C site, C(6) is bonded in a bent 120 degrees geometry to one C(7), one O(1), and one O(2) atom. The C(6)-C(7) bond length is 1.49 Å. The C(6)-O(1) bond length is 1.26 Å. The C(6)-O(2) bond length is 1.23 Å. In the eighth C site, C(7) is bonded in a trigonal planar geometry to one C(2), one C(6), and one C(8) atom. The C(7)-C(8) bond length is 1.38 Å. In the ninth C site, C(8) is bonded in a distorted single-bond geometry to one C(7), one C(9), and one H(2) atom. The C(8)-C(9) bond length is 1.35 Å. The C(8)-H(2) bond length is 0.93 Å. In the tenth C site, C(9) is bonded in a bent 120 degrees geometry to one C(1) and one C(8) atom. In the eleventh C site, C(10) is bonded in a 3-coordinate geometry to one C(11), one C(13), one C(4), and one N(1) atom. The C(10)-C(11) bond length is 1.20 Å. The C(10)-C(13) bond length is 1.39 Å. The C(10)-N(1) bond length is 1.33 Å. In the twelfth C site, C(11) is bonded in a 4-coordinate geometry to one C(10), one C(12), one C(4), and one N(1) atom. The C(11)-C(12) bond length is 1.36 Å. The C(11)-N(1) bond length is 1.36 Å. In the thirteenth C site, C(12) is bonded in a 4-coordinate geometry to one C(11), one C(13), one C(14), and one C(5) atom. The C(12)-C(13) bond length is 1.19 Å. In the fourteenth C site, C(13) is bonded in a 4-coordinate geometry to one C(10), one C(12), one C(14), and one C(5) atom. N(1) is bonded in a 7-coordinate geometry to one Zn(1), two equivalent C(10), two equivalent C(11), and two equivalent C(4) atoms. There are two 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(2) is bonded in a single-bond geometry to one C(8) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(6) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(6) atom. Linkers: 4 [C]12[C@@]34[C]5[C@]61[N@@]17[C@]82[C@]23[C@@]34[C@]45[C@]61[C]1[C@@]78[C]2[C@@]341.[C]12[C@]34[C]5[C@@]61[N@]17[C@@]82[C@@]23[C@]34[C@@]45[C@@]61[C]1[C@]78[C]2[C@]341 ,8 [O]C(=O)c1c[c]c(-c2[c]cc(C([O])=O)c[c]2)[c]c1. Metal clusters: 4 [C]1O[Zn]23O[C]O[Zn](O1)(O[C]O2)O[C]O3. The MOF has largest included sphere 15.33 A, density 0.49 g/cm3, surface area 3767.88 m2/g, accessible volume 1.64 cm3/g