pubmed-article:11459661 | pubmed:abstractText | The chemical synthesis of a series of N(1)-substituted derivatives of (2R,4R)-4-aminopyrrolidine-2,4-dicarboxylic acid [(2R,4R)-APDC] as constrained analogues of gamma-substituted glutamic acids is described. Appropriate substitution of the N(1)-position results in agonist, partial agonist, or antagonist activity at mGluR2, mGluR3, and/or mGluR6. | lld:pubmed |