U2P2H3(C4O5)2 crystallizes in the triclinic P-1 space group. There are two inequivalent U sites. In the first U site, U(1) is bonded in a distorted pentagonal planar geometry to one O(2), one O(4), one O(7), and two equivalent O(8) atoms. The U(1)-O(2) bond length is 2.25 Å. The U(1)-O(4) bond length is 2.36 Å. The U(1)-O(7) bond length is 2.47 Å. There is one shorter (2.37 Å) and one longer (2.60 Å) U(1)-O(8) bond length. In the second U site, U(2) is bonded in a 4-coordinate geometry to one O(1), one O(10), one O(3), and one O(6) atom. The U(2)-O(1) bond length is 2.29 Å. The U(2)-O(10) bond length is 2.50 Å. The U(2)-O(3) bond length is 2.30 Å. The U(2)-O(6) bond length is 2.33 Å. There are eight inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(2), one C(6), and one P(1) atom. The C(1)-C(2) bond length is 1.41 Å. The C(1)-C(6) bond length is 1.41 Å. The C(1)-P(1) bond length is 1.80 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one H(2) atom. The C(2)-C(3) bond length is 1.41 Å. The C(2)-H(2) bond length is 0.93 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(8) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-C(8) bond length is 1.48 Å. In the fourth C site, C(4) is bonded in a distorted trigonal planar geometry to one C(3), one C(5), and one P(2) atom. The C(4)-C(5) bond length is 1.45 Å. The C(4)-P(2) bond length is 1.79 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(4), one C(6), and one H(3) atom. The C(5)-C(6) bond length is 1.35 Å. The C(5)-H(3) bond length is 0.93 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(1), one C(5), and one C(7) atom. The C(6)-C(7) bond length is 1.49 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(4), and one O(5) atom. The C(7)-O(4) bond length is 1.25 Å. The C(7)-O(5) bond length is 1.25 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(10), and one O(9) atom. The C(8)-O(10) bond length is 1.23 Å. The C(8)-O(9) bond length is 1.29 Å. There are two inequivalent P sites. In the first P site, 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 1.51 Å. The P(1)-O(2) bond length is 1.52 Å. The P(1)-O(3) bond length is 1.53 Å. In the second P site, P(2) is bonded in a tetrahedral geometry to one C(4), one O(6), one O(7), and one O(8) atom. The P(2)-O(6) bond length is 1.49 Å. The P(2)-O(7) bond length is 1.54 Å. The P(2)-O(8) bond length is 1.53 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(9) atom. The H(1)-O(9) bond length is 0.82 Å. In the second H site, H(2) is bonded in a single-bond geometry to one C(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(5) atom. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one U(2) and one P(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one U(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one U(2) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one U(1) and one C(7) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one C(7) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one U(2) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one U(1) and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to two equivalent U(1) and one P(2) atom. In the ninth O site, O(9) is bonded in a water-like geometry to one C(8) and one H(1) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one U(2) and one C(8) atom. Linkers: 2 [O]C(=O)c1cc(P([O])([O])=O)c(C(=O)O)cc1P([O])([O])=O. Metal clusters: 4 [U]. RCSR code: ant. The MOF has largest included sphere 5.68 A, density 2.51 g/cm3, surface area 1895.18 m2/g, accessible volume 0.21 cm3/g