['CCOCC(C)N', 'O=CC1CCC(=O)NC1', 'CC', 'CC(CO)NC(=O)C1CCC(=O)NC1', 'CCO', 'CC(C)NC(=O)C1CCC(=O)NC1', 'CCCOCC', 'NC(=O)C1CCC(=O)NC1', 'O=C1CCCCN1', 'CCOCC(C)NC=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C1CCCCN1.