4F-PV8 CAS # 99799-28-8, also known as 4f-alpha-pyrrolidinoheptiophenone, 4F-PVP, or 4f-alpha-PHpP, has a new research compound called lupac 1-(4-fluorophenyl)-2-(pyrrolidin-1-yl)heptan-1-one. C17H24FNO, with an exact mass of 277.18 and a molecular weight of 277.38, is the chemical formula.