NC59253
2,4,10,17-Tetraazanonadec-2-enoic acid, 19-[1-[2-deoxy-5-O-[hydroxy[[hydroxy(phosphonooxy)phosphinyl]oxy]phosphinyl]-β-D-erythro-pentofuranosyl]-1,2,3,4-tetrahydro-2,4-dioxo-5-pyrimidinyl]-9,18-dioxo-3,8-bis[[(phenylmethoxy)carbonyl]amino]-, 1-(phenylmethyl) ester, (8S)-