Substituted phenidates CompoundStructure Substituted amphetamines Methylphenidate (MPH) 4-Methylmethylphenidate Ethylphenidate (EPH) 4-Fluoromethylphenidate (4-FMPH) Isopropylphenidate (IPH) Propylphenidate (PPH) 4-Fluoroethylphenidate (4-FEPH) Methylnaphthidate (HDMP-28) Ethylnaphthidate (HDEP-28)