Methanesulfonic acid (4S,5R)-4-[2-(4-methoxy-benzyloxy)-ethyl]-2-phenyl-[1,3]dioxan-5-yl ester

(2R,3S)-4-((4S,5S)-5-Azido-2-phenyl-[1,3]dioxan-4-yl)-2,3-dihydroxy-butyric acid ethyl ester