2NTL:
reference: A novel function for the N-terminal nucleophile hydrolase fold demonstrated by the structure of an archaeal inosine monophosphate cyclohydrolase(,)., Kang YN, Tran A, White RH, Ealick SE, Biochemistry. 2007 May 1;46(17):5050-62. Epub 2007 Apr 4. PMID: 17407260

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