<unk>  is a hypnotic/sedative. It has effects similar to those of barbiturates and was used in the 1970s-80s in the treatment of insomnia before being replaced with newer drugs with improved safety profiles.
Hexapropymate
Gefarnate
Carmofur
Meptazinol
Ecothiopate
Olaflur
Vamidothion
Tibezonium iodide