6M8F:
reference: Origin of high stereocontrol in olefin cyclopropanation catalyzed by an engineered carbene transferase., Tinoco A, Wei Y, Bacik JP, Carminati DM, Moore EJ, Ando N, Zhang Y, Fasan R, ACS Catal. 2019 Feb 1;9(2):1514-1524. doi: 10.1021/acscatal.8b04073. Epub 2018, Dec 28. PMID: 31134138

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