(R)-4-(tert-butyldimethylsilyloxy)-3-hydroxy-butyric acid benzyl ester

[1(3Z,5R,6S,7S),3R]-N-{3-[7,9-bis(tert-butyl-dimethylsilyloxy)-4,6-dimethyl-5-triisopropylsilyloxy-non-3-enyl]-2,5-dimethoxy-phenyl}-4-(tert-butyldimethylsilyloxy)-3-methoxy-butyramide

[1(1RS,3Z,5R,6S,7S),3R]-N-{3-[1-benzenesulfonyl-7,9-bis(tert-butyl-dimethylsilyloxy)-4,6-dimethyl-5-triisopropylsilyloxy-non-3-enyl]-2,5-dimethoxy-phenyl}-4-(tert-butyldimethylsilyloxy)-3-methoxy-butyramide