3LSX:
reference: Piracetam defines a new binding site for allosteric modulators of alpha-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid (AMPA) receptors., Ahmed AH, Oswald RE, J Med Chem. 2010 Mar 11;53(5):2197-203. PMID: 20163115

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).