SrC3H3O7 crystallizes in the monoclinic P2_1/c space group. Sr(1) is bonded in a 9-coordinate geometry to one O(1), one O(2), one O(5), one O(6), one O(7), two equivalent O(3), and two equivalent O(4) atoms. The Sr(1)-O(1) bond length is 3.05 Å. The Sr(1)-O(2) bond length is 2.69 Å. The Sr(1)-O(5) bond length is 2.63 Å. The Sr(1)-O(6) bond length is 2.58 Å. The Sr(1)-O(7) bond length is 2.72 Å. There is one shorter (2.60 Å) and one longer (2.63 Å) Sr(1)-O(3) bond length. There is one shorter (2.60 Å) and one longer (2.65 Å) Sr(1)-O(4) bond length. There are three inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(2) and one O(5) atom. The C(1)-O(2) bond length is 1.27 Å. The C(1)-O(5) bond length is 1.26 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(4) and one O(6) atom. The C(2)-O(4) bond length is 1.27 Å. The C(2)-O(6) bond length is 1.27 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(7) atom. The C(3)-O(1) bond length is 1.32 Å. The C(3)-O(7) bond length is 1.23 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to one O(3) and one O(6) atom. The H(1)-O(3) bond length is 1.01 Å. The H(1)-O(6) bond length is 1.64 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(3) and one O(5) atom. The H(2)-O(3) bond length is 0.99 Å. The H(2)-O(5) bond length is 1.70 Å. In the third H site, H(3) is bonded in a linear geometry to one O(1) and one O(2) atom. The H(3)-O(1) bond length is 1.06 Å. The H(3)-O(2) bond length is 1.47 Å. There are seven inequivalent O sites. In the first O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one C(1), and one H(3) atom. In the second O site, O(3) is bonded in a water-like geometry to two equivalent Sr(1), one H(1), and one H(2) atom. In the third O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Sr(1) and one C(2) atom. In the fourth O site, O(5) is bonded in a distorted single-bond geometry to one Sr(1), one C(1), and one H(2) atom. In the fifth O site, O(6) is bonded in a distorted trigonal planar geometry to one Sr(1), one C(2), and one H(1) atom. In the sixth O site, O(7) is bonded in a distorted single-bond geometry to one Sr(1) and one C(3) atom. In the seventh O site, O(1) is bonded in a bent 120 degrees geometry to one Sr(1), one C(3), and one H(3) atom. Linkers: 4 [O]C(=O)C(=O)O ,1 [O]C(=O)C([O])=O. Metal clusters: 4 [Sr]. The MOF has largest included sphere 1.61 A, density 2.56 g/cm3, surface area 2285.88 m2/g, accessible volume 0.04 cm3/g