4Q4D:
reference: Synthesis of Densely Phosphorylated Bis-1,5-Diphospho-myo-Inositol Tetrakisphosphate and its Enantiomer by Bidirectional P-Anhydride Formation., Capolicchio S, Wang H, Thakor DT, Shears SB, Jessen HJ, Angew Chem Int Ed Engl. 2014 Jul 14. doi: 10.1002/anie.201404398. PMID: 25044992

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