A solid dispersion comprising ((1S)-1-((((1S)-1-benzyl-2,3-dioxo-3-(cyclopropylamino)propyl)amino)carbonyl)-3-methylbutyl)carbamic acid 5-methoxy-3-oxapentyl ester made amorphous in the presence of a water-soluble cellulosic polymer has improved storage stability. The solid dispersion also has improved solubility for an improved bioavailability.
