Showing structure for C[Si](C)(C)NC1=NC(=O)C2=C([NH]1)N([Si](C)(C)C)C[C@@H]1CN(C3=CC=C(C(=O)N([C@@H](CCC(=O)O)C(=O)[O-])[Si](C)(C)C)C=C3)C=[N+]21