3688-44-6 4-Hydroxybutanoic acid 2-(1-methylethyl)hydrazide Butanoic acid, 4-hydroxy-, 2-(1-methylethyl)hydrazide Butyric acid, 4-hydroxy-, 2-isopropylhydrazide Isopropylhydrazide de l'acide gamma-hydroxybutyrique [French] PC 614