<unk>  is a member of the family of lipid molecules known as eicosanoids. A synthetic form of<unk> , used as a medicine, is referred to as epoprostenol.
Prostacyclin
Thromboxane
Angiotensin II 
Prostaglandin
Prostaglandin F2alpha
Pentostatin
Elcatonin
Nitric oxide