2-Methyl­sulfanyl-1,2,4-triazolo[1,5-a]quinazoline-5(4H)-thione

In the title compound, C₁₀H₈N₄S₂, comprising fused six-, six- and five-membered rings, the mol­ecule is close to being planar (r.m.s. deviation of the non-H atoms = 0.041 Å). The S-bound methyl group is folded away from the single N atom of the triazole ring and the NH group of the six-membered ring, allowing for the formation of centrosymmetric eight-membered {...HNCN}₂ synthons in the crystal. The resulting inversion dimers are connected into supra­molecular stacks aligned along the b-axis direction by π–π inter­actions [centroid–centroid distances = 3.6531 (12) and 3.7182 (12) Å].

Ethyl 2-amino-4-(4-bromo­phen­yl)-6-meth­oxy-4H-benzo[h]chromene-3-carboxyl­ate

In the title compound, C₂₃H₂₀BrNO₄, the pyran ring has a flattened boat conformation with the O and methine C atoms lying to one side of the plane [0.160 (5) and 0.256 (6) Å, respectively] defined by the remaining atoms. Nevertheless, the 4H-benzo[h]chromene ring system approximates a plane (r.m.s. deviation = 0.116 Å) with the bromo­benzene ring almost perpendicular [dihedral angle = 83.27 (16)°] and the ester group coplanar [C—C—C—O = 3.4 (5)°]; the meth­oxy substituent is also coplanar [C—O—C—C = 174.5 (3)°]. In addition to an intra­molecular N—H...O(ester carbon­yl) hydrogen bond, the ester carbonyl O atom also forms an inter­molecular N—H...O hydrogen bond with the second amine H atom, generating a zigzag supra­molecular chain along the c axis in the crystal packing. The chains are linked into layers in the bc plane by N—H...Br hydrogen bonds, and these layers are consolidated into a three-dimensional architecture by C—H...π inter­actions.