2-{1-[(S)-1-Hydroxymethyl-2-(1H-indol-3-yl)-ethylamino]-ethylidene}-5,5-dimethyl-cyclohexane-1,3-dione

(R)-1-{(2S,3S)-2-[[(S)-2-[1-(4,4-Dimethyl-2,6-dioxo-cyclohexylidene)-ethylamino]-3-(1H-indol-3-yl)-propyl]-(2-nitro-benzenesulfonyl)-amino]-3-methyl-pentanoyl}-pyrrolidine-2-carboxylic acid tert-butyl ester

(R)-1-{(2S,3S)-2-[[(S)-2-Amino-3-(1H-indol-3-yl)-propyl]-(2-nitro-benzenesulfonyl)-amino]-3-methyl-pentanoyl}-pyrrolidine-2-carboxylic acid tert-butyl ester