['CC1CNCC(C)O1', 'CC1CCCN1CC(N)=O', 'CC(N)=O', 'CC1CN(CC2CCCN2)CC(C)O1', 'CC1CN(C)CC(C)O1', 'NC(=O)CN1CCCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CNC(CN2CCOCC2)C1.