(1′S,12′R,13′S,17′S)-15′,15′-Dimethyl-1,2-dihydro-11′,14′,16′,18′-tetra­oxa-7′-aza­spiro­[indole-3,8′-penta­cyclo­[10.6.0.0^2,9.0^3,7.0^13,17]octa­deca­ne]-2,10′-dione

In the title compound, C₂₂H₂₄N₂O₆, the indole ring has a twist conformation and the tetra­hydro-2H-pyran-2-one ring a half-chair conformation. One of the pyrrolidine rings adopts an envelope conformation on the N atom, while the other has a twist conformation; the `butterfly' angle between their mean planes is 62.98 (11)°. The dioxolane ring adopts a twist conformation and the tetra­hydro­furan ring has an envelope conformation on the C atom in the fused tetra­hydro-2H-pyran-2-one ring adjacent to the O atom of the tetra­hydro­furan ring. The `butterfly' angle between the mean planes of these two five-membered rings is 69.14 (10)°. In the crystal, mol­ecules are linked by N—H...O hydrogen bonds, forming chains along the a axis.

3-Methyl-2-vinyl­pyridinium phosphate

In the title salt, C₈H₁₀N⁺·H₂PO₄⁻, the cation is essentially planar (r.m.s. deviation = 0.063 Å). In the crystal, the phosphate anions form inversion R₂²(8) dimers via pairs of O—H...O hydrogen bonds. These dimers are further linked by pairs of O—H...O hydrogen bonds, also enclosing R₂²(8) loops, forming chains running along [001]. The cations are bonded to the anions via N—H...O hydrogen bonds and C—H...O contacts.

Ethyl (2E,4E)-5-(3-bromo­phenyl­sulfon­yl)penta-2,4-dienoate

In the title compound, C₁₃H₁₃BrO₄S, both C=C double bonds adopt an E conformation. The S atom has a distorted tetra­hedral geometry with bond angles ranging from 102.17 (13) to 119.77 (14)°. The ethyl acrylate substituent adopts an extented conformation with all torsion angles close to 180°. In the crystal, mol­ecules are linked into centrosymmetric R₂²(14) dimers via pairs of C—H...O hydrogen bonds.

4-Bromo-2-(dieth­oxy­meth­yl)phenyl benzoate

In the title compound, C₁₈H₁₉BrO₄, the aromatic rings enclose a dihedral angle of 81.9 (7)°. There are no short directional contacts in the crystal structure.