(2Z)-1-(5-Hy­droxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)-3-(4-methyl­anilino)­but-2-en-1-one

A twist is evident in the title compound, C₂₁H₂₁N₃O₂, the dihedral angle between the terminal six-membered rings being 29.46 (10)°; the linked five- and six-membered rings are coplanar [1.30 (11)°]. The carbonyl O atom accepts intra­molecular hydrogen bonds from the adjacent hy­droxy and amine groups. The three-dimensional crystal packing is achieved through C—H...π inter­actions.

3-Amino-1-(thio­phen-2-yl)-9,10-dihydro­phenanthrene-2,4-dicarbonitrile

In the title compound, C₂₀H₁₃N₃S, the partially saturated ring adopts a twisted half-boat conformation with the methyl­ene C atom closest to the amino­benzene ring lying 0.690 (6) Å out of the plane defined by the five remaining atoms. The dihydro­phenanthrene residue has a folded conformation [dihedral angle between the outer benzene rings = 26.27 (18)°]. The thio­phen-2-yl ring forms a dihedral angle of 63.76 (19)° with the benzene ring to which it is attached. In the crystal, inversion dimers linked by pairs of N—H...N hydrogen bonds generate R₂²(12) loops. The dimers are linked into layers in the bc plane by weak C—H...π inter­actions. The thio­phen-2-yl ring is disordered over two essentially coplanar but opposite orientations in a 0.918 (4):0.082 (4) ratio.

4a-Methyl-2,3,4,4a-tetra­hydro-1H-carbazole-6-sulfonamide

In the title mol­ecule, C₁₃H₁₆N₂O₂S, the nine non-H atoms comprising the indole residue are approximately coplanar (r.m.s. deviation = 0.031 Å). The partially saturated ring adopts a chair conformation. One amine H forms an inter­molecular N—H...O hydrogen bond to a sulfonamide O atom, while the other amine H form is connected to the indole N atom of an adjacent mol­ecule via an N—H...N hydrogen bond, resulting in a three-dimensional architecture.

3,5-Dimethyl-1-phenyl-1H-pyrazole-4-carbaldehyde

In the title mol­ecule, C₁₂H₁₂N₂O, the five- and six-membered rings form a dihedral angle of 68.41 (16)°. The aldehyde group is nearly coplanar with the pyrazole ring [C—C—C—O torsion angle = −0.4 (5)°]. The three-dimensional architecture is sustained by weak C—H...O and C—H...π inter­actions.

4-{2-[(E)-Cyclo­pentyl­idene]hydrazin-1-yl}benzene­sulfonamide

The title mol­ecule, C₁₁H₁₅N₃O₂S, features a five-membered ring which is twisted about the middle CH₂-CH₂ bond. The benzene ring is inclined with respect to the imine residue [C-N-N-C torsion angle = 165.4 (2)°]. Supra­molecular layers in the bc plane are formed by hydrogen bonds between the amine H atoms and sulfonamide O and imine N atoms, as well as by a weak hydrazine H-atom inter­molecular inter­action with the second sulfonamide O atom.