| 6A5H: reference: Enzyme-catalysed [6+4] cycloadditions in the biosynthesis of natural products., Zhang B, Wang KB, Wang W, Wang X, Liu F, Zhu J, Shi J, Li LY, Han H, Xu K, Qiao HY, Zhang X, Jiao RH, Houk KN, Liang Y, Tan RX, Ge HM, Nature. 2019 Apr;568(7750):122-126. doi: 10.1038/s41586-019-1021-x. Epub 2019 Mar, 13. PMID: 30867595 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).