SEARCH Articles Figures Tables 2-hydroxy-4-phenylbutyric acid 4-hydroxy-3-methylphenyl 7-Phenylbutyric acid A -ethylamine A-Hydroxy acids A-Phenylbutyric acid ACE ACE inhibitors Acid inhibitors Enantioseparation Ethylamines For enantioseparation Hydroxy ethylamine Intermediate key L- ethylamines Methylphenyl Phenylbutyrate Reciprocal key