(R)-4-((S)-2-{(R)-2-[(4aR,6S,7R,8R,8aS)-6-Benzyloxy-7-(2-benzyloxy-acetylamino)-2-phenyl-hexahydro-pyrano[3,2-d][1,3]dioxin-8-yloxy]-propionylamino}-3-methyl-butyrylamino)-4-carbamoyl-butyric acid benzyl ester

(R)-4-((S)-2-{(R)-2-[(4aR,6S,7R,8R,8aS)-6-Benzyloxy-7-(2-benzyloxy-acetylamino)-2-phenyl-hexahydro-pyrano[3,2-d][1,3]dioxin-8-yloxy]-propionylamino}-4-methyl-pentanoylamino)-4-carbamoyl-butyric acid benzyl ester