3-Benzyl-2H-chromen-2-one

The title compound, C₁₆H₁₂O₂, is a coumarin which was isolated from stones of the Chinese traditional medicine Clausena lansium. The pyrone ring is almost planar, with a mean deviation of 0.0135 (4) Å. The benzene ring (A) of the benzopyrone unit forms dihedral angles of 1.82 (5) and 72.86 (2)° with the pyrone ring and the substituent benzene ring, respectively. The crystal structure is stabilized by weak π–π stacking inter­actions, with a minimum centroid–centroid distance between benzene rings of 3.6761 (7) Å.

1-(3-Fluoro­phen­yl)-3-(4-nitro­phen­yl)urea

In the title compound, C₁₃H₁₀FN₃O₃, the dihedral angle between the fluoro­phenyl and nitro­phenyl ring planes is 6.51 (9)°. The crystal structure features N—H...O hydrogen bonds.

Diethyl 3,3′-(phenyl­methyl­ene)bis­(1H-indole-2-carboxyl­ate)

In the title compound, C₂₉H₂₆N₂O₄, the benzene ring is twisted by 73.5 (5) and 84.9 (3)° with respect to the mean planes of the two indole ring systems; the mean planes of the indole ring systems are oriented at a dihedral angle of 82.0 (5)°. In the crystal, mol­ecules are linked by pairs of N—H...O hydrogen bonds into chains.