Bedingfield et al (1995) Structure-activity relationships for a series of
phenylglycine derivatives acting at metabotropic glutamate receptors (mGluRs).
Br.J.Pharmacol. 116 3323. Sekiyamaet al (1996)
Structure-activity relationships of new agonists and antagonists of different
metabotropic glutamate receptor subtypes. Br.J.Pharmacol. 117
1493.