Ethyl 3-(4-chloro-phen-yl)-2-phenyl-3-(4-phenyl-1,2,3-selena-diazol-5-yl)propano-ate.

In the title compound, C25H21ClN2O2Se, the selena-diazole ring is almost planar [maximum deviation = 0.004 (2) Å], and the adjacent benzene ring is twisted by 50.6 (1)° with respect to this ring.

2-Chloro-1-(2,4,4-trimethyl-2,3,4,5-tetra-hydro-1H-1,5-benzodiazepin-1-yl)ethanone.

In the title compound, C14H19ClN2O, the diazepine ring adopts a boat conformation. The Cl atom of the chloro-acetyl group is trans to the N atom of the diazepine ring. In the crystal, the mol-ecules form chains running along the diagonal of the ac plane through N-H⋯O hydrogen bonds.