LY-293284, also known as 4,ñ-methylene-5-acetyl-DPT, is a research chemical developed by the pharmaceutical company Eli Lilly and used for scientific studies. It acts as a potent and selective 5-HT<sub>1A</sub> receptor full agonist. It was derived through structural simplification of the ergoline based psychedelic LSD, but is far more selective for 5-HT<sub>1A</sub> with over 1000àselectivity over other serotonin receptor subtypes and other targets. It has anxiogenic effects in animal studies.