(S)-[(S)-2-((S)-2-Amino-4-methyl-pentanoylamino)-5-hydroxy-5-(5-hydroxy-pyridin-2-yl)-pentanoylamino]-[5-(2,4-dioxo-3,4-dihydro-2-H-pyrimidin-1-yl)-3,4-dihydroxy-tetrahydro-furan-2-yl]-acetic acid AIDS-087993 AIDS087993 Leucyl-nikkomycin Z