(2S,3R)-3-[4-Benzyloxy-2-(tert-butyl-dimethyl-silanyloxy)-3-chloro-phenyl]-2-[(R)-2-tert-butoxycarbonylamino-2-(4-methoxy-phenyl)-acetylamino]-3-triisopropylsilanyloxy-propionic acid ethyl ester

2-[2-{2-tert-butoxycarbonylamino-2-[3,5-dibromo-4-(pyrrolidin-1-ylazo)-phenyl]-acetylamino}-2-(4-methoxy-phenyl)-acetylamino]-3-[2-(tert-butyl-dimethyl-silanyloxy)-3-chloro-4-hydroxy-phenyl]-3-triisopropylsilanyloxy-propionic acid ethyl ester