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 LL, Berg A, Magnusson A, Malmlund HO, Sandell BM, 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.