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