1D2A:
reference: Structural and mechanistic basis for the activation of a low-molecular weight protein tyrosine phosphatase by adenine., Wang S, Stauffacher CV, Van Etten RL, Biochemistry 2000 Feb 15;39(6):1234-42. PMID: 10684601

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