(5S,8S,11S,13aR)-5-((S)-sec-Butyl)-8-(1H-indol-3-ylmethyl)-6-(2-nitro-benzenesulfonyl)-11-(6-oxo-octyl)-decahydro-3a,6,9,12-tetraaza-cyclopentacyclododecene-4,10,13-trione

(R)-1-{(2S,3S)-2-[[(S)-2-((S)-2-tert-Butoxycarbonylamino-8-oxo-decanoylamino)-3-(1H-indol-3-yl)-propyl]-(2-nitro-benzenesulfonyl)-amino]-3-methyl-pentanoyl}-pyrrolidine-2-carboxylic acid tert-butyl ester