['C=CCN', 'COc1cccc(CN(C)C=O)c1', 'C=CCNC=O', 'CNCc1cccc(OC)c1', 'CO', 'C=CCNC(=O)N(C)Cc1ccccc1', 'C=CC', 'COc1cccc(CN(C)C(N)=O)c1', 'C=CCNC(=O)NC', 'COc1cccc(C)c1', 'COc1ccccc1', 'C=CCNC(=O)N(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.