Showing structure for C[Si](C)(C)NC1=NC2=C(N=CN2C2OC(COP(=O)([O-])OP(=O)([O-])OP(=O)([O-])[O-])C(OP(=O)([O-])OP(=O)([O-])O[Si](C)(C)C)C2O)C(=O)N1[Si](C)(C)C