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[23-tert-butoxycarbonylamino-7,27-bis-(1-hydroxy-1-methyl-ethyl)-8,11,28,31-tetramethyl-2,6,9,12,15,22,26,29,32,35-decaoxo-5,25-dioxa-1,8,11,14,20,21,28,31,34,40-decaaza-tricyclo[34.4.0.016,21]tetracont-3-yl]-carbamic acid tert-butyl ester