2CTB:
reference: High-resolution structure of the complex between carboxypeptidase A and L-phenyl lactate., Teplyakov A, Wilson KS, Orioli P, Mangani S, Acta Crystallogr D Biol Crystallogr. 1993 Nov 1;49(Pt 6):534-40. PMID: 15299490

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