CuC3N2H2S crystallizes in the monoclinic P2_1/c space group. Cu(1) is bonded to one N(1), one N(2), and two equivalent S(1) atoms to form corner-sharing CuS2N2 tetrahedra. The Cu(1)-N(1) bond length is 1.91 Å. The Cu(1)-N(2) bond length is 2.00 Å. There is one shorter (2.31 Å) and one longer (2.34 Å) Cu(1)-S(1) bond length. There are three inequivalent C sites. In the first C site, C(1) is bonded in a distorted linear geometry to one N(1) and one S(1) atom. The C(1)-N(1) bond length is 1.18 Å. The C(1)-S(1) bond length is 1.64 Å. In the second C site, C(2) is bonded in a distorted trigonal planar geometry to one C(3), one N(2), and one H(1) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-N(2) bond length is 1.35 Å. The C(2)-H(1) bond length is 1.09 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one N(2), and one H(2) atom. The C(3)-N(2) bond length is 1.35 Å. The C(3)-H(2) bond length is 1.09 Å. There are two inequivalent N sites. In the first N site, N(2) is bonded in a trigonal planar geometry to one Cu(1), one C(2), and one C(3) atom. In the second N site, N(1) is bonded in a linear geometry to one Cu(1) and one C(1) atom. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(2) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(3) atom. S(1) is bonded in a trigonal non-coplanar geometry to two equivalent Cu(1) and one C(1) atom. Linkers: 2 c1cnccn1. Metal clusters: 4 [Cu]. The MOF has largest included sphere 1.87 A, density 2.33 g/cm3, surface area 3319.95 m2/g, accessible volume 0.06 cm3/g