(3R,4R)-3-Benzoylamino-4-[3,5-bis-benzyloxy-4-(2-benzyloxy-6-benzyloxycarbonyl-benzoyl)-benzoyloxy]-azepane-1-carboxylic acid benzyl ester

4-[2-(benzyloxycarbonyl)benzoyl]-3,5-dibenzyloxybenzoic acid