SnO3PC5H4N crystallizes in the monoclinic P2_1/c space group. The structure consists of four 02329_fluka molecules inside a SnC4PNH3O3 framework. In the SnC4PNH3O3 framework, Sn(1) is bonded in a distorted rectangular see-saw-like geometry to one N(1), one O(1), one O(2), and one O(3) atom. The Sn(1)-N(1) bond length is 2.63 Å. The Sn(1)-O(1) bond length is 2.15 Å. The Sn(1)-O(2) bond length is 2.14 Å. The Sn(1)-O(3) bond length is 2.27 Å. There are four inequivalent C sites. In the first C site, C(4) is bonded in a distorted single-bond geometry to one C(1) and one H(3) atom. The C(4)-C(1) bond length is 1.40 Å. The C(4)-H(3) bond length is 1.09 Å. In the second C site, C(5) is bonded in a distorted bent 120 degrees geometry to one N(1) and one H(4) atom. The C(5)-N(1) bond length is 1.34 Å. The C(5)-H(4) bond length is 1.09 Å. In the third C site, C(1) is bonded in a trigonal planar geometry to one C(2), one C(4), and one P(1) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-P(1) bond length is 1.81 Å. In the fourth C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(1), one N(1), and one H(1) atom. The C(2)-N(1) bond length is 1.34 Å. The C(2)-H(1) bond length is 1.09 Å. P(1) is bonded in a tetrahedral geometry to one C(1), one O(1), one O(2), and one O(3) atom. The P(1)-O(1) bond length is 1.54 Å. The P(1)-O(2) bond length is 1.54 Å. The P(1)-O(3) bond length is 1.53 Å. N(1) is bonded in a distorted bent 120 degrees geometry to one Sn(1), one C(2), and one C(5) atom. There are three 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(3) is bonded in a single-bond geometry to one C(4) atom. In the third H site, H(4) is bonded in a single-bond geometry to one C(5) atom. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Sn(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Sn(1) and one P(1) atom. Linkers: 4 [O]P([O])(=O)c1cccnc1. Metal clusters: 4 [Sn]. The MOF has largest included sphere 2.63 A, density 2.43 g/cm3, surface area 2697.83 m2/g, accessible volume 0.05 cm3/g