A number of related compounds are known, with a similar structure but having the indole core flipped and/or replaced with related cores such as indoline, indazole, benzothiophene, or benzofuran. These similarly are primarily active as agonists at the 5-HT2 family of serotonin receptors, with applications in the treatment of glaucoma, cluster headaches or as anorectics. Further reading TiHKAL See also Ergoline Lysergamide Iboga alkaloid Substituted amphetamine Substituted benzofuran Substituted cathinone Substituted methylenedioxyphenethylamine Substituted phenethylamine 2C, DOx, 25-NB References Tryptamines Functional groups