Showing structure for C[Si](C)(C)NC1=NC(=O)C2=C(NC[C@@H]3CN(C4=CC=C(C(=O)N([C@@H](CCC(=O)O[Si](C)(C)C)C(=O)[O-])[Si](C)(C)C)C=C4)C=[N+]23)[NH]1