['CC(C)OCCCN', 'O=CCn1ccc(=O)c2ccccc21', 'CCC', 'O=C(Cn1ccc(=O)c2ccccc21)NCCCO', 'CC(C)O', 'CCCNC(=O)Cn1ccc(=O)c2ccccc21', 'CCCOC(C)C', 'NC(=O)Cn1ccc(=O)c2ccccc21', 'CC(=O)NCCCOC(C)C', 'O=c1cc[nH]c2ccccc12']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=c1cc[nH]c2ccccc12.