1WMR:
reference: Crystal structure of Aspergillus niger isopullulanase, a member of glycoside hydrolase family 49., Mizuno M, Koide A, Yamamura A, Akeboshi H, Yoshida H, Kamitori S, Sakano Y, Nishikawa A, Tonozuka T, J Mol Biol. 2008 Feb 8;376(1):210-20. Epub 2007 Dec 5. PMID: 18155243

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