ZnC11H8(N3O)2C3N2H6O crystallizes in the orthorhombic Pna2_1 space group. The structure consists of four 2-imidazolidone molecules inside a ZnC11H8(N3O)2 framework. In the ZnC11H8(N3O)2 framework, Zn(1) is bonded in a tetrahedral geometry to one N(1), one N(3), one N(6), and one O(1) atom. The Zn(1)-N(1) bond length is 1.96 Å. The Zn(1)-N(3) bond length is 2.00 Å. The Zn(1)-N(6) bond length is 2.00 Å. The Zn(1)-O(1) bond length is 1.96 Å. There are eleven inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one N(1), one N(3), and one H(1) atom. The C(1)-N(1) bond length is 1.35 Å. The C(1)-N(3) bond length is 1.34 Å. The C(1)-H(1) bond length is 1.09 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one N(2), one N(4), and one H(2) atom. The C(2)-N(2) bond length is 1.34 Å. The C(2)-N(4) bond length is 1.34 Å. The C(2)-H(2) bond length is 1.09 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(4), one N(4), and one N(5) atom. The C(3)-C(4) bond length is 1.42 Å. The C(3)-N(4) bond length is 1.36 Å. The C(3)-N(5) bond length is 1.35 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(3), one C(5), and one N(3) atom. The C(4)-C(5) bond length is 1.41 Å. The C(4)-N(3) bond length is 1.39 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(4), one N(1), and one N(2) atom. The C(5)-N(1) bond length is 1.38 Å. The C(5)-N(2) bond length is 1.35 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(8), one O(1), and one O(2) atom. The C(6)-C(8) bond length is 1.50 Å. The C(6)-O(1) bond length is 1.30 Å. The C(6)-O(2) bond length is 1.25 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(8), one C(9), and one H(5) atom. The C(7)-C(8) bond length is 1.40 Å. The C(7)-C(9) bond length is 1.38 Å. The C(7)-H(5) bond length is 1.09 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one C(11), one C(6), and one C(7) atom. The C(8)-C(11) bond length is 1.40 Å. In the ninth C site, C(9) is bonded in a distorted trigonal planar geometry to one C(7), one N(6), and one H(6) atom. The C(9)-N(6) bond length is 1.35 Å. The C(9)-H(6) bond length is 1.09 Å. In the tenth C site, C(10) is bonded in a distorted bent 120 degrees geometry to one C(11), one N(6), and one H(7) atom. The C(10)-C(11) bond length is 1.39 Å. The C(10)-N(6) bond length is 1.35 Å. The C(10)-H(7) bond length is 1.09 Å. In the eleventh C site, C(11) is bonded in a distorted trigonal planar geometry to one C(10), one C(8), and one H(8) atom. The C(11)-H(8) bond length is 1.09 Å. There are six inequivalent N sites. In the first N site, N(4) is bonded in a bent 120 degrees geometry to one C(2) and one C(3) atom. In the second N site, N(5) is bonded in a trigonal planar geometry to one C(3), one H(3), and one H(4) atom. The N(5)-H(3) bond length is 1.03 Å. The N(5)-H(4) bond length is 1.02 Å. In the third N site, N(6) is bonded in a trigonal planar geometry to one Zn(1), one C(10), and one C(9) atom. In the fourth N site, N(1) is bonded in a trigonal planar geometry to one Zn(1), one C(1), and one C(5) atom. In the fifth N site, N(2) is bonded in a bent 120 degrees geometry to one C(2) and one C(5) atom. In the sixth N site, N(3) is bonded in a distorted trigonal planar geometry to one Zn(1), one C(1), and one C(4) atom. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. 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 N(5) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one N(5) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(7) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(9) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(10) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(11) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(6) atom. In the second O site, O(2) is bonded in a single-bond geometry to one C(6) atom. Linkers: 1 NC1=NC=NC2=NC=N[C]12 ,1 NC1=NC=[N]=C2C1=NC=N2 ,4 [O]C(=O)c1ccncc1 ,1 Nc1ncnc2=[N]=CN=c12 ,1 NC1=NC=[N]=C2[C]1N=C[N]2. Metal clusters: 4 O=[C]O[Zn]. The MOF has largest included sphere 2.22 A, density 1.62 g/cm3, surface area 4565.29 m2/g, accessible volume 0.23 cm3/g