(R)-(-)-2-(2,5-Dihydrophenyl)glycine is a cycohexadiene based amino acid used in the preparation of cephalosporin-type antibiotics such as Cephradine (C261800).
Kemperman, G.J. et al.: Eur. J. Org. Chem., 10, 1817 (2001); Takano, S. et al.: Yakug. Zas., 102, 617 (1982);