The crystal structure determination of C17H18ClN5 has been undertaken
as part of our studies of dopamine receptors. The diazepine ring is in
a boat conformation while the piperazine ring is in the normal chair
conformation. The dihedral angle between the two aromatic rings that l
ie on the same side of the diazepine moiety is 126.4(1)degrees. There
is one N--H ... N hydrogen bond [N ... N 3.184(3) Angstrom].