Ethyl 5-bromo-naphtho-[2,1-b]furan-2-carboxyl-ate.

In the title compound, C(15)H(11)BrO(3), the dihedral angle between the naphtho-furan ring system (r.m.s. deviation = 0.022 Å) and the side chain is 4.50 (2)°. In the crystal, short Br⋯Br [3.4435 (7) Å] contacts propagating along [010] in a zigzag manner and weak π-π inter-actions [shortest centroid-centroid separation = 3.573 (2) Å] directedalong [100] are observed.

(4-Fluoro-phen-yl)(1H-pyrrol-2-yl)methan-one.

In the title mol-ecule, C(11)H(8)FNO, the dihedral angle between the pyrrole and benzene rings is 49.16 (6)°. In the crystal, adjacent mol-ecules are linked by pairs of N-H⋯O hydrogen bonds, forming inversion dimers.

(4-But-oxy-phen-yl)(1H-pyrrol-2-yl)methanone.

The asymmetric unit of the title compound, C(15)H(17)NO(2), contains two independent mol-ecules in which the dihedral angles between the pyrrole and benzene rings are 42.43 (9) and 45.70 (9)°. In both mol-ecules, the but-oxy chains are disordered over two sets of sites, with occupancy ratios of 0.701 (7):0.299 (7) and 0.869 (4):0.131 (4). Each mol-ecule forms a dimer with an inversion-related mol-ecule, through a pair of N-H⋯O hydrogen bonds. Weak C-H⋯O inter-actions link these dimers in the crystal structure.

4-Methyl-2,6-bis-(pyrrolidin-1-yl)pyrimidine.

In the crystal of the title compound, C13H20N4, the mol-ecule is nearly planar, the dihedral angles between the pyrimidine and the two pyrrolidine rings being 4.71 (2) and 4.50 (2)°. The crystal features inversion-related dimers linked by pairs of C-H⋯N hydrogen bonds generating R2(2)(16) patterns. The dimeric units are further linked into C(6) chains via an additional C-H⋯N hydrogen bond.