(1S)-7′-[[Bis(1-methylethyl)amino]carbonyl]-2,2′,3,3′-tetrahydro-1,1′-spirobi[1H-indene]-7-carboxylic acid

(1S)-7′-[[Bis(1-methylethyl)amino]carbonyl]-2,2′,3,3′-tetrahydro-1,1′-spirobi[1H-indene]-7-carboxylic acid