The present invention relates to disulfide masked prodrug compounds, compositions and methods that are amenable to bioactivation by a reducing agent such as glutathione. Such disulfide based compounds, compositions, and methods can be useful, for example, in providing novel prodrugs for use as therapeutics. The compounds feature a conformationally restricted disulfide phosphotriester moiety to mask anionic charge. The compounds include a 1,2-dithigne moiety.
