[[[5-[2,4-dioxo-5-[3-[2-[2-[2-[2-[2-[2-[6-[6-[5-(7-oxo-3-thia-6,8-diaz abicyclo[3.3.0]oct-2-yl)pentanoylamino]hexanoylamino]hexanoylamino]eth oxy]ethoxy]ethoxy]ethoxy]ethoxy]ethoxy]prop-1-ynyl]pyrimidin-1-yl]-3-h ydroxy-oxolan-2-yl]methoxy-hydroxy-phosphoryl]oxy-hydroxy-phosphoryl]o xyphosphonic acid