The hallucinogenic plant Banisteria caapi contains, in addition to harmine, the alkaloids harmaline and d-tetrahydroharmine, identified using modern techniques such as paper chromatography and column chromatography. The presence of these three alkaloids—differing only in their oxidation state—in the same plant is of biogenetic interest, and harmaline or d-tetrahydroharmine may have substantial psychotomimetic activity contributing to the plant's effectiveness. Prestonia amazonicum leaves yielded N,N-dimethyltryptamine, a psychotomimetic amine previously found in other plant species, which was the sole alkaloid detected in its extract.