Showing structure for CC(=CCNC1=NC=NC2=C1N=CN2C1OC(COP(=O)([O-])OP(=O)([O-])OP(=O)([O-])O[Si](C)(C)C)C(O[Si](C)(C)C)C1O[Si](C)(C)C)CO[Si](C)(C)C