Diphenylprolinol (also known as diphenyl-2-pyrrolidinylmethanol, D2PM, α,α-diphenyl-2-pyrrolidinemethanol, and GPI-2089) and 2-(diphenylmethyl)pyrrolidine (also known as desoxy-D2PM, 2-benzhydrylpyrrolidine) are the pyrrolidine analogues of pipradrol and desoxypipradrol, respectively.