2DS2:
reference: Crystal structure of Mabinlin II: a novel structural type of sweet proteins and the main structural basis for its sweetness., Li DF, Jiang P, Zhu DY, Hu Y, Max M, Wang DC, J Struct Biol. 2008 Apr;162(1):50-62. Epub 2008 Jan 11. PMID: 18308584

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