E exclusively helicid 6′-esters as characterized by 13C NMR and 1H
E exclusively helicid 6′-esters as characterized by 13C NMR and 1H NMR (Bruker DRX-400 NMR Spectrometer, Bruker Co., Germany) at one hundred MHz and 400 MHz, respectively, with DMSO-d6 being…