PbC5N2H4O5 crystallizes in the monoclinic P2_1/c space group. Pb(1) is bonded in a 5-coordinate geometry to one N(2), one O(1), one O(5), and two equivalent O(3) atoms. The Pb(1)-N(2) bond length is 2.71 Å. The Pb(1)-O(1) bond length is 2.60 Å. The Pb(1)-O(5) bond length is 2.50 Å. There is one shorter (2.53 Å) and one longer (2.69 Å) Pb(1)-O(3) bond length. There are five inequivalent C sites. In the first C site, C(4) is bonded in a trigonal planar geometry to one N(1), one N(2), and one O(4) atom. The C(4)-N(1) bond length is 1.38 Å. The C(4)-N(2) bond length is 1.37 Å. The C(4)-O(4) bond length is 1.26 Å. In the second C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(2), and one O(3) atom. The C(5)-C(2) bond length is 1.47 Å. The C(5)-O(2) bond length is 1.29 Å. The C(5)-O(3) bond length is 1.28 Å. In the third C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one N(1), and one O(1) atom. The C(1)-C(2) bond length is 1.44 Å. The C(1)-N(1) bond length is 1.39 Å. The C(1)-O(1) bond length is 1.26 Å. In the fourth C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(5) atom. The C(2)-C(3) bond length is 1.40 Å. In the fifth C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one N(2), and one H(1) atom. The C(3)-N(2) bond length is 1.33 Å. The C(3)-H(1) bond length is 1.09 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one C(1), one C(4), and one H(2) atom. The N(1)-H(2) bond length is 1.04 Å. In the second N site, N(2) is bonded in a bent 120 degrees geometry to one Pb(1), one C(3), and one C(4) atom. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the second H site, H(2) is bonded in a single-bond geometry to one N(1) atom. In the third H site, H(3) is bonded in a single-bond geometry to one O(5) atom. The H(3)-O(5) bond length is 1.00 Å. In the fourth H site, H(4) is bonded in a distorted single-bond geometry to one O(2) and one O(5) atom. The H(4)-O(2) bond length is 1.64 Å. The H(4)-O(5) bond length is 1.01 Å. There are five inequivalent O sites. In the first O site, O(5) is bonded in a water-like geometry to one Pb(1), one H(3), and one H(4) atom. In the second O site, O(4) is bonded in a distorted single-bond geometry to one C(4) atom. In the third O site, O(1) is bonded in a single-bond geometry to one Pb(1) and one C(1) atom. In the fourth O site, O(2) is bonded in a distorted bent 120 degrees geometry to one C(5) and one H(4) atom. In the fifth O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Pb(1) and one C(5) atom. Linkers: 4 [O]C(=O)[C]1C=NC(=O)NC1=O. Metal clusters: 4 [Pb]. The MOF has largest included sphere 1.39 A, density 3.56 g/cm3, surface area 1643.94 m2/g, accessible volume 0.01 cm3/g