Bromo-acetic acid (2S,3S,4aR,6S,7R,8aS)-2-acetyl-7-benzyloxy-6-(2-benzyloxy-ethyl)-2,6,8a-trimethyl-octahydro-pyrano[3,2-b]pyran-3-yl ester

(Dimethoxy-phosphoryl)-acetic acid (2S,3S,4aR,6S,7R,8aS)-2-acetyl-7-benzyloxy-6-(2-benzyloxy-ethyl)-2,6,8a-trimethyl-octahydro-pyrano[3,2-b]pyran-3-yl ester