(5R,6R,7S)-9-Iodo-2,2-dimethyl-1,3-dioxa-spiro[4.4]non-8-ene-6,7-diol

(R)-3-tert-Butoxycarbonylamino-3-[6-chloro-5-((5R,6R,7S)-6-hydroxy-9-iodo-2,2-dimethyl-1,3-dioxa-spiro[4.4]non-8-en-7-yloxy)-pyridin-2-yl]-propionic acid methyl ester