['CC(C)C(=O)NCCN', 'CC(=O)c1cccc(OCC=O)c1', 'CC(C)C=O', 'CC(=O)c1cccc(OCC(=O)NCCN)c1', 'CC(=O)c1cccc(O)c1', 'CC(=O)NCCNC(=O)C(C)C', 'CC(=O)c1ccccc1', 'CC(C)C(=O)NCCNC(=O)CO', 'CCNC(=O)C(C)C', 'CC(=O)c1cccc(OCC(N)=O)c1', 'CC(C)C(N)=O', 'CCNC(=O)COc1cccc(C(C)=O)c1', 'CC=O', 'CC(C)C(=O)NCCNC(=O)COc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.