['CC(C)CCCN', 'O=CN1CCN(c2ccncc2)CC1', 'CC(C)CCCNC=O', 'c1cc(N2CCNCC2)ccn1', 'CCCC(C)C', 'NC(=O)N1CCN(c2ccncc2)CC1', 'c1ccncc1', 'CC(C)CCCNC(=O)N1CCNCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cc(N2CCNCC2)ccn1.