RU-28251, also known as 4,ñ-methylene-N,N-dipropyltryptamine (4,ñ-methylene-DPT), is a tricyclic dopamine receptor agonist of the simplified or partial ergoline family. It is a selective D<sub>2</sub>-like receptor agonist. The drug inhibits prolactin secretion in animals. RU-28251 was first described in the literature by 1978.