C=CCO[C@H]1[C@H](n2cnc3c(=O)[nH]c(N)nc32)O[C@H](C(O)[Si](c2ccccc2)(c2ccccc2)C(C)(C)C)[C@]1(O)[Si](c1ccccc1)(c1ccccc1)C(C)(C)C