S1(=O)(=O)C=C(N)C2(O1)C(CO[Si](C)(C)C(C)(C)C)OC(N3C=NC4=C3C(=O)N(C=N4)C5OC(CO[Si](C)(C)C(C)(C)C)C6(OS(=O)(=O)C=C6N)C5O[Si](C)(C)C(C)(C)C)C2O[Si](C)(C)C(C)(C)C