Substituted carboxylic acids CompoundStructure Substituted carboxylic acidsSubstituted amino acids γ-Butyrolactone (GBL) γ-Hydroxybutyric acid (GHB) Creatine Pantothenic acid (vitamin B5) Menthyl isovalerate (Validolum) Tilidine Ibopamine Omberacetam 3-[4-[2-[(4-Fluorophenyl)-phenylmethoxy]ethyl]piperazin-1-yl]propanoic acid (S-350) Amlodipine 3-(4-{2-[Bis(4-fluorophenyl)methoxy]ethyl}-1-piperazinyl)-1-phenylpropyl decanoate (DBL-583)