['Cc1cc(C=O)c(C)s1', 'CC(C)C(=O)NCCN', 'CC(C)C=O', 'Cc1cc(C(=O)NCCN)c(C)s1', 'CCNC(=O)C(C)C', 'Cc1cc(C(N)=O)c(C)s1', 'CC(C)C(N)=O', 'CCNC(=O)c1cc(C)sc1C', 'Cc1ccc(C)s1', 'CC(C)C(=O)NCCNC=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccsc1.