Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... The synthesis and the pharmacological evaluation at metabotropic glutamate receptors of S-2-(4′-carboxy-cubyl)glycine (ACUDA, 9) are described. S-2-(4′-Carboxy-cubyl)glycine is a structurally novel group I selective antagonist for mGluR1 subtype.