(S)-ATPO is the (S)-enantiomer of ATPO, which is a competitive antagonist at GluR1-4 (AMPA-preferring) receptors[1].
References
[1] Hogner A, et al. Competitive antagonism of AMPA receptors by ligands of different classes: crystal structure of ATPO bound to the GluR2 ligand-binding core, in comparison with DNQX. J Med Chem. 2003;46(2):214-221. DOI:10.1021/jm020989v
