Complex sentence: The alkaloid bears a close structural resemblance to the psychedelic alkaloid dimethyltryptamine and was speculated to have psychoactivity by Alexander Shulgin, no reports on lespedamine's biological activity have been published.
Split into simpler sentences: The alkaloid bears a close structural resemblance to the psychedelic alkaloid dimethyltryptamine and was speculated to have psychoactivity by Alexander Shulgin. No reports on lespedamine's biological activity have been published.