((S)-1-{(S)-1-[(S)-1-((S)-1-{(S)-1-[4-(6-Methoxy-quinolin-8-ylamino)-pentylcarbamoyl]-3-methyl-butylcarbamoyl}-ethylcarbamoyl)-3-methyl-butylcarbamoyl]-ethylcarbamoyl}-3-methyl-butyl)-carbamic acid tert-butyl ester