Horsfiline is an oxindole

alkaloid Alkaloids are a class of basic, naturally occurring organic compounds that contain at least one nitrogen atom. This group also includes some related compounds with neutral and even weakly acidic properties. Some synthetic compounds of similar ...

found in the plant '' Horsfieldia superba'', which is used in traditional herbal medicine. It has analgesic effects and has been the subject of research both to produce it synthetically by convenient routes and to develop analogues and derivatives which may have improved analgesic effects.Alf Claesson, Britt-Marie Swahn, Odd-Geir Berge. Spirooxindole derivatives that act as analgesics. US Patent 6774132
/ref> It is a member of the

spiroindolone The spiroindolones are a class of compounds in which an indolone ring is substituted with another ring in a spiro arrangement. Alkaloids in this class include horsfiline, rhynchophylline, gelsemine, carapanaubine, and maremycin E. Spiroindol ...

class. Elacomine has a similar chemical structure.

References

{{reflist Phenol ethers Lactams Oxindoles Pyrrolidine alkaloids Spiro compounds