(2S)-4-[[1-(4,4-Dimethyl-2,6-dioxocyclohexylidene)-3-methylbutyl]amino]-2-[[(9H-fluoren-9-ylmethoxy)carbonyl]amino]butanoic acid

(2S)-4-[[1-(4,4-Dimethyl-2,6-dioxocyclohexylidene)-3-methylbutyl]amino]-2-[[(9H-fluoren-9-ylmethoxy)carbonyl]amino]butanoic acid