4Y1P:
reference: Characterization of two beta-decarboxylating dehydrogenases from Sulfolobus acidocaldarius., Takahashi K, Nakanishi F, Tomita T, Akiyama N, Lassak K, Albers SV, Kuzuyama T, Nishiyama M, Extremophiles. 2016 Nov;20(6):843-853. Epub 2016 Sep 2. PMID: 27590116

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