<unk>  (INN, trade name Perfan) is an imidazole phosphodiesterase inhibitor. It is used in the treatment of congestive heart failure and is selective for phosphodiesterase 3.
Enoximone
Lapisteride
Nandrolone phenylpropionate
Estradiol pivalate
Estrone sulfate 
Segesterone acetate
Ethisterone
Gestonorone caproate