(E)-2-{[(2-Amino­pyridin-3-yl)imino]­meth­yl}-4,6-di-tert-butyl­phenol

In the title compound, C₂₀H₂₇N₃O, the hy­droxy group forms an intra­molecular O—H...N hydrogen bond with the imino N atom. The dihedral angle between the aromatic rings is 33.09 (9)°. In the crystal, mol­ecules form centrosymmetric dimers via pairs of N—H...N hydrogen bonds involving amino­pyridine fragments.

(1S,8R,15S,19R)-17-Benzyl-17-aza­penta­cyclo­[6.6.5.0^2,7.0^9,14.0^15,19]nona­deca-2(7),3,5,9(14),10,12-hexa­ene chloro­form monosolvate

In the title compound, C₂₅H₂₃N·CHCl₃, the dihydro­anthracene unit is bent with a dihedral angle between the benzene rings of 57.82 (8)°. The N atom of the pyrrolidine heterocycle, which has an envelope conformation with the N atom as the flap, exhibits a pronounced pyramidalization [Σ(C—N—C) = 328.07°], indicating an accentuated N-donor character. In the crystal, this behaviour is evident by the C—H...N hydrogen bond involving a solvent mol­ecule and the N atom. The absolute configuration at the C-atom fused positions of the pyrrolidine group were crystallographically confirmed to be S and R.

1-Allyl-6-nitro-1H-indazole

The fused five- and six-membered rings in the title mol­ecule, C₁₀H₉N₃O₂, are essentially coplanar, the largest deviation from the mean plane being 0.012 (1) Å for the C atom linked to the nitro group. The fused-ring system makes a dihedral angle of 11.34 (6)° with the nitro group, leading to a syn-periplanar conformation. The plane through the atoms forming the allyl group is nearly perpendicular to the indazole fused-ring system, as indicated by the dihedral angle of 73.3 (5)°. In the crystal, each mol­ecule is linked to its symmetry equivalent about the center of inversion by pairs of non-classical C—H...O hydrogen bonds, forming an extended tape motif parallel to the (-12-1) plane.