4-Fluoroamphetamine Drug Description4-Fluoroamphetamine, also known as para-fluoroamphetamine is a psychoactive research chemical of the phenethylamine and substituted amphetamine chemical classes. It produces stimulant and entactogenic effects, and is described subjectively as being between amphetamine and MDMA. Formula: C9H12FN Molar mass: 153.2 g/mol Boiling point: 215 °C ChemSpider ID: 9592 PubChem CID: 9986 People also search for: 4-Fluoromethamphetamine, 2C-B, MDMA,.