(E)-3-(4-Meth­oxy­phen­yl)-3-[3-(4-meth­oxy­phen­yl)-1H-pyrazol-1-yl]prop-2-enal

In the title mol­ecule, C₂₀H₁₈N₂O₃, the pyrazole ring forms a dihedral angle of 2.2 (1)° with its meth­oxy­phenyl substituent and a dihedral angle of 67.2 (1)° with the benzene substituent on the propenal unit. In the crystal, mol­ecules are connected by weak C—H...O hydrogen bonds, forming R₂²(26) and R₂²(28) cyclic dimers that lie about crystallographic inversion centres. These dimers are further linked through C—H...O and C—H...N hydrogen bonds, forming C(8), C(9), C(10) and C(16) chain motifs. These primary motifs are further linked to form secondary C₂²(15) chains and R₂²(18) rings.

Bis(4-sulfamoylanilinium) sulfate

In the title salt, 2C₆H₉N₂O₂S⁺·SO₄²⁻, the sulfate S atom is situated on a crystallographic twofold axis (the symmetry of the anion is 2). The anion exerts intense libration, which is manifested by shortening of the observed sulfate S—O bonds, as well as by features in the electron-density map. The crystal structure is stabilized through a three-dimensional hydrogen-bonding network formed by strong N—H...O hydrogen bonds.

Ethyl 3-(4-chloro­benzo­yl)-1-(4-chloro­benz­yl)-4-(4-chloro­phen­yl)-2,2-dioxo-3,4,6,7,8,8a-hexa­hydro-1H-pyrrolo­[2,1-c][1,4]thia­zine-1-carboxyl­ate

In the title compound, C₃₀H₂₈Cl₃NO₅S, the pyrrolidine ring adopts an envelope conformation (with the N atom as the flap) and the thia­zine ring is in a distorted chair conformation. The mol­ecular structure shows three intra­molecular C—H...O inter­actions leading to self-associated ring S(6) and two S(7) motifs. In the crystal, the molecules are linked by C—H...O and C—H...Cl inter­actions. Two R₂²(10) and one R₂²(16) centrosymmetrically related ring motifs are observed in the unit cell and they are connected through C(6) and C(11) chain motifs extending along the b and c axes, respectively.

4-Sulfamoylanilinium perchlorate

In the crystal of the title salt, C₆H₉N₂O₂S⁺·ClO₄⁻, the components are linked by N—H...O hydrogen bonds, forming a three-dimensional network. The cations are connected along a and b axes, leading to linear and zigzag C(3) and C(8) chain motifs, respectively. A cation–anion inter­action along the c axis leads to a C₂²(12) chain motif. R₃³(18) and R₃³(20) ring motifs are observed as cation–anion-type inter­actions. These hydrogen-bonding ring and chain motifs are localized at z = 0 or 1, leading to alternate hydro­philic and hydro­phobic regions along the c axis as a result of the stacking of anions and the aromatic cationic parts.