5-Propyl-6-(p-tolyl­sulfan­yl)pyrimidine-2,4(1H,3H)-dione

In the title pymiridine-2,4-dione derivative, C₁₄H₁₆N₂O₂S, the dihedral angle between the six-membered rings is 66.69 (10)°. The mol­ecule is twisted about the C_p—S (p = pyrimidine) bond, with a C—S—C—N torsion angle of −19.57 (16)°. In the crystal, adjacent mol­ecules form inversion dimers through pairs of strong N—H...O hydrogen bonds, generating an R₂²(8) ring motif. The dimers are connected into chains extending along the c-axis direction through additional N—H...O hydrogen bonds.

4-(2-Meth­oxy­phen­yl)piperazin-1-ium 6-chloro-5-isopropyl-2,4-dioxopyrimidin-1-ide

In the cation of the title salt, C₁₁H₁₇N₂O⁺·C₇H₈ClN₂O₂⁻, the piperazine ring adopts a distorted chair conformation and contains a positively charged N atom with quaternary character. Its mean plane makes a dihedral angle of 42.36 (8)° with the phenyl ring of its 2-meth­oxy­phenyl substituent. The 2,4-dioxopyrimidin-1-ide anion is generated by deprotonation of the N atom at the 1-position of the pyrimidine­dione ring. Intra­molecular C—H...O hydrogen bonds generate S(6) ring motifs in both the cation and the anion. In the crystal, N—H...O, N—H...N and C—H...O hydrogen bonds are also observed, resulting in a two-dimensional network parallel to the ab plane. The crystal stability is further consolidated by weak C—H...π inter­actions.

3-(Adamantan-1-yl)-4-benzyl-1H-1,2,4-triazole-5(4H)-thione

The title compound, C₁₉H₂₃N₃S, is a functionalized triazoline-3-thione derivative. The benzyl ring is almost normal to the planar 1,2,4-triazole ring (r.m.s. deviation = 0.007 Å) with a dihedral angle of 86.90 (7)°. In the crystal, molecules are linked by pairs of N—H...S hydrogen bonds, forming inversion dimers that enclose R₂²(8) loops. The crystal packing is further stabilized by weak C—H...π inter­actions that link adjacent dimeric units into supra­molecular chains extending along the a-axis direction.