benzyl (4-((12S,22Z,32Z,52S,122Z,8S,11S,15R)-15-benzyl-11-methyl-4,6,9,13,16-pentaoxo-7,10,14-triaza-3(2,4)-oxazola-2,12(2,4)-dithiazola-1(2,1),5(1,2)-dipyrrolidinacyclohexadecaphane-8-yl)butyl)carbamate