Salvinorin A 

Salvinorin A is the only psychoactive constituent of the Salvia Divinorum plant. Structurally related Salvinorins B-F also exist, but none are known to be psychoactive. The strongest naturally occurring psychoactive known to man. Produces extreme visual hallucinations, time distortion, and many other characteristics psychoactives are valued for. Its effects are considered unpleasant by a lot of people, but amazing by just as many.
The chemical acts on the Kappa Opioid receptors, but the drug itself is not an Opiate by any stretch of the imagination, and is the first compound known to man to act on this region of the brain without being an alkaloid.

The drug has no effect on the 5-HT serotonin receptors, which is the method of action for all classic psychedelics.

Salvinorin A is not an analog of any previously scheduled substance, and is legal almost everywhere( except Australia, and a few other places).

Salvia Divinorum is an exceptionally hard plant to grow, being very sensitive to climate changes. The plant exists almost entirely due to cloning, because the plant hardly every sets seed, and when it does, they have a 5-20% viability rate.

Dude, you better use a nice scale to measure those Salvinorin A crystals, or else you're gonna trip balls.

Salvinorin A by SOMA6996 September 11, 2006