1LWI:
reference: Structure of 3 alpha-hydroxysteroid/dihydrodiol dehydrogenase complexed with NADP+., Bennett MJ, Schlegel BP, Jez JM, Penning TM, Lewis M, Biochemistry 1996 Aug 20;35(33):10702-11. PMID: 8718859

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