N-[(4-{2-[(5S)-5-(5-{2-[4-({[(1S)-1,3-dicarboxypropyl]amino}carbonyl)phenyl]ethyl}-2-amino-4-oxo-1,7-dihydropyrrolo[2,3-d]pyrimidin-6-yl)-2-amino-4,6-dioxo-1,5,6,7-tetrahydropyrrolo[2,3-d]pyrimidin-5-yl]ethyl}phenyl)carbonyl]-L-glutamic acid N-[(4-{2-[(5R)-5-(5-{2-[4-({[(1S)-1,3-dicarboxypropyl]amino}carbonyl)phenyl]ethyl}-2-amino-4-oxo-1,7-dihydropyrrolo[2,3-d]pyrimidin-6-yl)-2-amino-4,6-dioxo-1,5,6,7-tetrahydropyrrolo[2,3-d]pyrimidin-5-yl]ethyl}phenyl)carbonyl]-L-glutamic acid