['CC(C)N', 'O=CCc1noc(C2CCCOCC2)n1', 'CCC', 'NC(=O)Cc1noc(C2CCCOCC2)n1', 'CC(=O)NC(C)C', 'c1noc(C2CCCOCC2)n1', 'C1CCCOCC1', 'CC(C)NC(=O)Cc1ncon1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1noc(C2CCCOCC2)n1.