(2"S",6"S")-DMBMPP is an analogue of the 25-NB compounds and is the most highly selective agonist of the 5-HT2A receptor that has been identified to date.O-4310 (1-isopropyl-6-fluoropsilocin) is a tryptamine derivative that is a highly selective agonist of the 5-HT2A receptor.