Hexapropymate is a hypnotic/sedative. It has effects similar to those of barbiturates and was used in the 1970s-1980s in the treatment of insomnia before being replaced with newer drugs with improved safety profiles.
^Gustafsson, L. L.; Berg, A.; Magnusson, A.; Malmlund, H. O.; Sandell, B. M.; Stig, R. (1989). "Hexapropymate self-poisoning causes severe and long-lasting clinical symptoms". Medical toxicology and adverse drug experience. 4 (4): 295–301. doi:10.1007/bf03259914. PMID2770531.