['CC(C)CCCN', 'O=CN1CCN(c2ncccn2)CC1', 'CC(C)CCCNC=O', 'c1cnc(N2CCNCC2)nc1', 'CCCC(C)C', 'NC(=O)N1CCN(c2ncccn2)CC1', 'c1cncnc1', 'CC(C)CCCNC(=O)N1CCNCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cnc(N2CCNCC2)nc1.