Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Salvinorin A is the main active psychotropic molecule in Salvia divinorum, a Mexican plant which has a long history of use as an entheogen by indigenous Mazatec shamans. Salvinorin A is a hallucinogenic compound with psychedelic/dissociative effects. It is structurally distinct from other naturally-occurring hallucinogens (such as DMT, psilocybin, and mescaline) because it contains no nitrogen atoms, hence it is not an alkaloid.