(S)-2-amino-2-benzyl-4-pentenoic acid
(S)-2-amino-2-ethyl-3-phenylpropionic acid
(S)-2-amino-2-methyl-3-phenylpropanoic acid
(R)-2-amino-2-methyl-3-phenylpropanoic acid
(R)-3-Benzyl-3-methyl-9bH-1,5-dioxa-3a-aza-cyclopenta[a]naphthalene-2,4-dione