3V9B:
reference: Stereoselective synthesis of novel pyrazole derivatives using tert-butansulfonamide as a chiral auxiliary., Park CM, Jeon DJ, Org Biomol Chem. 2012 Apr 7;10(13):2613-20. doi: 10.1039/c2ob06495b. Epub 2012, Feb 27. PMID: 22371117

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