L-Glutamic acid, N-(N-((3S,4S)-4-hydroxy-4-(5-hydroxy-2-pyridinyl)-L-valyl)-2-(tetrahydro-3,4-dihydroxy-5-(1,2,3,4-tetrahydro-2,4-dioxo-5-pyrimidinyl)-2-furanyl)glycyl)-, (2R-(2alpha,3beta,4beta,5alpha))-