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(2E,4E,6E,8E,10E)-11-[(S)-2-Phenyl-1-((3S,7S,13S,16S,19S)-13,16,17-trimethyl-2,6,12,15,18-pentaoxo-5-oxa-1,11,14,17-tetraaza-tricyclo[17.3.0.07,11]docos-3-ylcarbamoyl)-ethylcarbamoyl]-undeca-2,4,6,8,10-pentaenoic acid tert-butyl ester