SrC2H4O5 crystallizes in the tetragonal I4/m space group. Sr(1) is bonded to one O(3), two equivalent O(1), and four equivalent O(2) atoms to form distorted edge-sharing SrO7 pentagonal bipyramids. The Sr(1)-O(3) bond length is 2.55 Å. Both Sr(1)-O(1) bond lengths are 2.49 Å. There are two shorter (2.54 Å) and two longer (2.58 Å) Sr(1)-O(2) bond lengths. C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(1)-O(1) bond length is 1.27 Å. The C(1)-O(2) bond length is 1.29 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) atom. The H(1)-O(3) bond length is 1.04 Å. In the second H site, H(2) is bonded in a distorted T-shaped geometry to two equivalent H(2) and one O(3) atom. There is one shorter (0.60 Å) and one longer (0.74 Å) H(2)-H(2) bond length. The H(2)-O(3) bond length is 1.14 Å. There are three inequivalent O sites. In the first O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent H(1), and two equivalent H(2) atoms. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one Sr(1) and one C(1) atom. In the third O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Sr(1) and one C(1) atom. Linkers: 8 [O]C(=O)C([O])=O. Metal clusters: 8 [Sr]. The MOF has largest included sphere 5.25 A, density 2.12 g/cm3, surface area 2653.51 m2/g, accessible volume 0.13 cm3/g