6CL2:
reference: Selective and Rapid Cell-Permeable Inhibitor of Human Caspase-3., Solania A, Gonzalez-Paez GE, Wolan DW, ACS Chem Biol. 2019 Nov 15;14(11):2463-2470. doi: 10.1021/acschembio.9b00564., Epub 2019 Aug 1. PMID: 31334631

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