['CC(C)CN', 'O=CCNC(=O)CC12CC3CC(CC(C3)C1)C2', 'CC(C)CNC(=O)CN', 'O=CCC12CC3CC(CC(C3)C1)C2', 'CC(C)C', 'NC(=O)CNC(=O)CC12CC3CC(CC(C3)C1)C2', 'CC(=O)NCC(C)C', 'NC(=O)CC12CC3CC(CC(C3)C1)C2', 'C1C2CC3CC1CC(C2)C3', 'CC(=O)NCC(=O)NCC(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1C2CC3CC1CC(C2)C3.