2-Amino-3-phenylbutanoic acid 2260-12-0 Hydrocinnamic acid, alpha-amino-beta-methyl- (8CI) NSC 518100 Phenylalanine, beta-methyl- (9CI) alpha-Amino-beta-phenyl butyric acid beta-Methylphenylalanine beta-Phenyl-alpha-aminobutyric acid