SrC5N2H4O5 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded in a 9-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. The Sr(1)-O(1) bond length is 2.69 Å. There is one shorter (2.60 Å) and one longer (2.74 Å) Sr(1)-O(2) bond length. There is one shorter (2.59 Å) and one longer (2.69 Å) Sr(1)-O(3) bond length. There is one shorter (2.52 Å) and one longer (2.80 Å) Sr(1)-O(4) bond length. There is one shorter (2.70 Å) and one longer (2.73 Å) Sr(1)-O(5) bond length. There are five inequivalent C sites. In the first C site, C(4) is bonded in a distorted single-bond geometry to one C(3), one C(5), and one N(2) atom. The C(4)-C(3) bond length is 1.39 Å. The C(4)-C(5) bond length is 1.48 Å. The C(4)-N(2) bond length is 1.37 Å. In the second C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(3), and one O(4) atom. The C(5)-O(3) bond length is 1.27 Å. The C(5)-O(4) bond length is 1.27 Å. In the third C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(1)-C(2) bond length is 1.48 Å. The C(1)-O(1) bond length is 1.26 Å. The C(1)-O(2) bond length is 1.29 Å. In the fourth C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one N(1) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-N(1) bond length is 1.36 Å. In the fifth C site, C(3) is bonded in a distorted single-bond geometry to one C(2), one C(4), and one H(4) atom. The C(3)-H(4) bond length is 1.08 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a distorted single-bond geometry to one C(2) atom. In the second N site, N(2) is bonded in a 2-coordinate geometry to one C(4) and one H(3) atom. The N(2)-H(3) bond length is 1.04 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(5) atom. The H(1)-O(5) bond length is 1.00 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(5) atom. The H(2)-O(5) bond length is 0.99 Å. In the third H site, H(3) is bonded in a single-bond geometry to one N(2) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(3) atom. There are five inequivalent O sites. In the first O site, O(5) is bonded in a water-like geometry to two equivalent Sr(1), one H(1), and one H(2) atom. In the second O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Sr(1) and one C(5) atom. In the third O site, O(1) is bonded in a single-bond geometry to one Sr(1) and one C(1) atom. In the fourth O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Sr(1) and one C(1) atom. In the fifth O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Sr(1) and one C(5) atom. Linkers: 4 [O]C(=O)c1cc(C([O])=O)[nH]n1. Metal clusters: 4 [Sr]. The MOF has largest included sphere 1.54 A, density 2.53 g/cm3, surface area 2066.36 m2/g, accessible volume 0.03 cm3/g