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