(S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)amino)-4-(3-((2,2,4,6,7-pentamethyl-2,3-dihydrobenzofuran-5-yl)sulfonyl)guanidino)butanoic acid

(S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)amino)-4-(3-((2,2,4,6,7-pentamethyl-2,3-dihydrobenzofuran-5-yl)sulfonyl)guanidino)butanoic acid