1K4Y:
reference: Structural insights into CPT-11 activation by mammalian carboxylesterases., Bencharit S, Morton CL, Howard-Williams EL, Danks MK, Potter PM, Redinbo MR, Nat Struct Biol 2002 May;9(5):337-42. PMID: 11967565

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