HgH2(C2O)2CH3C3NH4 is Indium-derived structured and crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of four 02329_fluka molecules, four 1-methylethenylamine molecules, and four HgH2(C2O)2 clusters. In each HgH2(C2O)2 cluster, Hg(1) is bonded in a linear geometry to one C(3) and one O(1) atom. The Hg(1)-C(3) bond length is 2.06 Å. The Hg(1)-O(1) bond length is 2.16 Å. There are four inequivalent C sites. In the first C site, C(8) is bonded in a distorted single-bond geometry to one C(3) and one H(9) atom. The C(8)-C(3) bond length is 1.40 Å. The C(8)-H(9) bond length is 1.09 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(2)-O(1) bond length is 1.31 Å. The C(2)-O(2) bond length is 1.25 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one Hg(1), one C(4), and one C(8) atom. The C(3)-C(4) bond length is 1.40 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(3) and one H(6) atom. The C(4)-H(6) bond length is 1.09 Å. There are two inequivalent H sites. In the first H site, H(9) is bonded in a single-bond geometry to one C(8) atom. In the second H site, H(6) is bonded in a single-bond geometry to one C(4) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted water-like geometry to one Hg(1) and one C(2) atom. In the second O site, O(2) is bonded in a single-bond geometry to one C(2) atom. Linkers: 1 Nc1cc[c]cc1. Metal clusters: . The MOF has largest included sphere 2.14 A, density 2.74 g/cm3, surface area 2901.31 m2/g, accessible volume 0.08 cm3/g