CuC4N2H4S crystallizes in the monoclinic C2/c space group. Cu(1) is bonded in a 4-coordinate geometry to one N(1), one N(2), and two equivalent S(1) atoms. The Cu(1)-N(1) bond length is 1.89 Å. The Cu(1)-N(2) bond length is 1.99 Å. There is one shorter (2.40 Å) and one longer (2.45 Å) Cu(1)-S(1) bond length. There are four 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 1.63 Å. In the second C site, C(2) is bonded in a distorted trigonal planar geometry to one C(2), one C(4), and one N(2) atom. The C(2)-C(2) bond length is 1.41 Å. The C(2)-C(4) bond length is 1.49 Å. The C(2)-N(2) bond length is 1.35 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one N(2) and one H(1) atom. The C(3)-N(2) bond length is 1.35 Å. The C(3)-H(1) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted trigonal non-coplanar geometry to one C(2), one H(2), one H(3), and one H(4) atom. The C(4)-H(2) bond length is 1.10 Å. The C(4)-H(3) bond length is 1.10 Å. The C(4)-H(4) bond length is 1.10 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a linear geometry to one Cu(1) and one C(1) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one Cu(1), one C(2), and one C(3) atom. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(4) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(4) atom. S(1) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Cu(1) and one C(1) atom. Linkers: 2 Cc1nccnc1C. Metal clusters: 4 [Cu]. The MOF has largest included sphere 1.64 A, density 2.19 g/cm3, surface area 3368.82 m2/g, accessible volume 0.05 cm3/g