Telepathine was originally thought to be the active chemical constituent of Banisteriopsis caapi, a key plant ingredient in the preparation of ayahuasca; a sacramental beverage from the Amazon. This isolated chemical was so named because of the reported effects of Ayahuasca among the indigenous users, including: collective contact with and/or visions of jaguars, snakes, and jeweled birds, and ancestral spirits; the ability to see future events; and as the name suggests, telepathic communication among tribal members. It was assumed to be a newly discovered chemical at the time, however, it was soon realized that Telepathine was already more widely known as "harmine" from its previous discovery in Peganum harmala (Syrian Rue).

Three name, telepathine, yageine (yajeine) and banisterine were assigned to the alkaloids isolated by early workers.
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We have recently had occacion to examine this plant anew
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In our hand Banesteria caapi "Ayahuasca" has yielded harmine (I) as its major alkaloid. We have found in addition lesser quantities of harmaline, and a third alkaloid, previously undescribed
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Tetrahydroharmine appeared to be the only likely alternate structure
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My understanding is that telepathic was the name originally given for an alkaloid mixture that was later identified to contain two distinct alkaloids which became named harmine and harmaline.

Norharman and harmalol are found in decent amounts in Russian olive, in Tribulus the amounts are so low that it is not worth pursuing. Isolating them can be tricky, they are alcohol soluble but might not be accessible using AB and Manske methods.