(2R,3R)-3-Hydroxy-2-methyl-5-phenyl-pentanoic acid (1S,2R)-2-(toluene-4-sulfonylamino)-acenaphthen-1-yl ester

(2R,3R)-4-Benzyloxy-3-hydroxy-2-methyl-butyric acid (1S,2R)-2-(toluene-4-sulfonylamino)-acenaphthen-1-yl ester