Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... The -1,3,5,7-tetraol derivative was synthesized with complete stereo-selection based on the stereoselective reduction of a six-membered β-keto hemiacetal and a subsequent hemiacetal ring opening. ... The NMR spectra of the compound ( ∼ ) were obtained in CDCl 3 on a JEOL FX-400 or ...