O-benzyl N-2-(tert-butyldimethylsilyloxy)-2-[8-benzyloxy-7-methoxy-4(1H)-quinolinon-5-yl]ethyl carbamate

5-[5-[2-(benzyloxycarbonylamino)-1-(tert-butyldimethylsilyloxy)ethyl]-2-benzyloxy-3-methoxyphenylaminomethylene]-2,2-dimethyl-1,3-dioxane-4,6-dione