A substitute to GHB, currently legal in many countries.

1,4-Butanediol is converted into GHB in the body, but it is quite heavy on the kidneys. Furthermore, when combined with alcohol, it is even more dangerous than GHB+booze. This is caused by an enzyme in the liver which processes both substances. 1-4BD's effects come with a longer onset and duration, but are less euphoric.

In other words: not worth it. The real thing is relatively safe when used with care, but the Butanediol is toxic even in small doses.

Chemical names:
Butanediol, butane-1,4-diol, 1,4-butylene glycol, tetramethylene 1,4-diol 1,4-dihydroxybutane, 1,4-tetramethylene glycol, butylene glycol