[[[5-[2,4-dioxo-5-[(E)-3-[3-[2-[5-(7-oxo-3-thia-6,8-diazabicyclo[3.3.0 ]oct-2-yl)pentanoylamino]ethyldisulfanyl]propanoylamino]prop-1-enyl]py rimidin-1-yl]-3-hydroxy-oxolan-2-yl]methoxy-hydroxy-phosphoryl]oxy-hyd roxy-phosphoryl]oxyphosphonic acid