['CC(CN)CO', 'O=CC(=O)Nc1ccc2c3c(cccc13)CC2', 'CC(CO)CNC(=O)C=O', 'Nc1ccc2c3c(cccc13)CC2', 'CC(C)CO', 'NC(=O)C(=O)Nc1ccc2c3c(cccc13)CC2', 'CC(CO)CNC(=O)C(N)=O', 'c1cc2c3c(cccc3c1)CC2']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cc2c3c(cccc3c1)CC2.