4O41:
reference: Amides are excellent mimics of phosphate internucleoside linkages and are well tolerated in short interfering RNAs., Mutisya D, Selvam C, Lunstad BD, Pallan PS, Haas A, Leake D, Egli M, Rozners E, Nucleic Acids Res. 2014;42(10):6542-51. doi: 10.1093/nar/gku235. Epub 2014 May 9. PMID: 24813446

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