['CCC(N)CO', 'O=CNC1CC1c1ccccc1', 'CCC(CO)NC=O', 'NC1CC1c1ccccc1', 'CCCCO', 'NC(=O)NC1CC1c1ccccc1', 'CCC(CO)NC(N)=O', 'c1ccc(C2CC2)cc1', 'c1ccccc1', 'CCC(CO)NC(=O)NC1CC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(C2CC2)cc1.