Showing structure for COC1=C(N([Si](C)(C)C)[Si](C)(C)C)C(=O)C2=NC(C3=NC(C(=O)O[Si](C)(C)C)=C(C)C(C4=CC=C(OC)C(OC)=C4O)=C3N([Si](C)(C)C)[Si](C)(C)C)=CC=C2C1=O