4-06-00-00645 (Beilstein Handbook Reference) 4-PHENOXYBUTYRIC ACID 6303-58-8 BRN 1640610 Butanoic acid, 4-phenoxy- (9CI) Butyric acid, 4-phenoxy- EINECS 228-603-6 NSC 43294 NSC 64178 gamma-Phenoxybutyric acid