Synthetic excitatory amino acid that characterizes a specific subset of ionotropic glutamate receptors in the CNS, consequently known as AMPA-receptors. The activity resides primarily in the l-isomer. Prepn: J. J. Hansen, P. Krogsgaard-Larsen, J. Chem. Soc. Perkin Trans. 1 1980, 1826; M. Begtrup, F. A. Slok, Synthesis 1993, 861. Characterization of neuroexcitatory activity: P. Krogsgaard-Larsen et al., Nature 284, 64 (1980). Resolution of enantiomers and stereospecific activity: J. J. Hansen et al., J. Med. Chem. 26, 901 (1983). Review of AMPA receptors: K. Borges, R. Dingledine, Prog. Brain Res. 116, 153-170 (1998); and potential for pharmacological intervention: G. J. Lees, Drugs 59, 33-78 (2000).