N-(4-Fluoro­phen­yl)-2,6-dimethyl-1,3-dioxan-4-amine

In the title compound, C₁₂H₁₆FNO₂, the dioxane ring adopts a chair conformation with the methyl substituents and the C—N bond in equatorial orientations. Its mean plane subtends a dihedral angle of 40.17 (6)° with the benzene ring. In the crystal, weak N—H...F hydrogen bonds link the mol­ecules into C(7) chains propagating in [100].

2,15-Dioxa-7,18,19,20,23-penta­aza­hepta­cyclo­[21.6.1.1^17,20.0^1,8.0^3,7.0^9,14.0^24,29]hentriaconta-9,11,13,17(31),18,24,26,28-octaen-30-one

In the title compound, C₂₄H₂₃N₅O₃, the oxindole ring system is nearly planar, with a dihedral angle between the two fused rings of 3.3 (1)°. In the fused pyrrolo–oxazole ring system, the oxazole and pyrrolidine rings adopt envelope conformations with the spiro C atom and one of the methyl­ene C atoms, respectively, as the flap atoms. In the crystal, mol­ecules are linked into a helical chain along the b axis via C—H...O inter­actions generating R₂¹(7) and R₂²(8) ring motifs.

Pyrrolidinium-2-carboxyl­ate–4-nitro­phenol (1/2)

In the title compound, C₅H₉NO₂·2C₆H₅NO₃, the pyrrolidine ring of the pyrrolidinium-2-carboxyl­ate zwitterion adopts a twisted conformation on the –CH₂—CH₂– bond adjacent to the N atom. The mean plane of this pyrrolidine ring forms dihedral angles of 25.3 (3) and 32.1 (3)° with the two nitro­phenol rings. An intra­molecular N—H...O hydrogen bond occurs in the pyrrolidinium-2-carboxyl­ate mol­ecule. In the crystal, mol­ecules are linked via O—H...O and N—H...O hydrogen bonds, enclosing R³₂(8) ring motifs, forming chains running parallel to the a axis. These chains are further cross-linked by O—H...O and C—H...O hydrogen bonds, forming undulating two-dimensional networks lying parallel to (001).