Cool, I've never heard about this one before! The latin name is Tabernaemontana sananho, by the way. Seems like ibogaine, voacangine and related indole alkaloids are the best bets, as these substances are found in other plants of the genus. I found a mention of it being used together with Mansoa spp. to give visions, but other than that it seems pretty much unexplored by western science.