(2S)-2-amino-4-[4-[[2-[(2S)-2-[[(1S)-5-amino-1-[[(1S)-1-[[(1S,2S)-1-[[(1S)-2-amino-1-methyl-2-oxo-ethyl]carbamoyl]-2-methyl-butyl]carbamoyl]-4-guanidino-butyl]carbamoyl]pentyl]carbamoyl]pyrrolidin-1-yl]-2-oxo-ethyl]amino]butyl-[[(2R,3S,4R)-5-[(9S)-6-aminopurin-9-yl]-3,4-dihydroxy-tetrahydrofuran-2-yl]methyl]amino]butanoic acid