81018-84-0

N-methyl-N-(2-oxobutanoyl)valyl-N,4-dimethyl-N-[2,10,17,25-tetramethyl-27-(3-methylbutyl)-24-(1-methylethyl)-6,16-bis(2-methylpropyl)-5,8,12,15,18,23,26,29-octaoxohexacosahydro-1H,12H-dipyrrolo[2,1-i:2',1'-r][1,4,7,10,13,16,19,22]oxaheptaazacyclopentacosi