(2R,3S,4S,5R,6R)-2-((pivaloyloxy)methyl)-6-((S)-7-(pyridin-3-yl)-1,4-dithia-8-azaspiro[4.5]decan-8-yl)tetrahydro-2H-pyran-3,4,5-triyl tris(2,2-dimethylpropanoate)