AIDS-045052 AIDS045052 Bis(Nal-Val-Phe)phosphinate isostere {2-[2-(2-Amino-3-naphthalen-1-yl-propanoylamino)-3-methyl-butanoylamino]-1-hydroxy-3-phenyl-propyl}-{1-[2-(2-amino-3-naphthalen-1-yl-propanoylamino)-3-methyl-butanoylamino]-2-phenyl-ethyl}-phosphinic acid ethyl ester