['CC(C)(N)C(N)=O', 'Cc1ccc(C)c(OCCCCC=O)c1', 'Cc1ccc(C)c(O)c1', 'CCCCC(=O)NC(C)(C)C(N)=O', 'Cc1ccc(C)cc1', 'CC(C)(NC(=O)CCCCO)C(N)=O', 'CC(C)C(N)=O', 'Cc1ccc(C)c(OCCCCC(N)=O)c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.