['CC(C)N(C)CC=O', 'NCCCN1C(=O)NC2(CCCC2)C1=O', 'CCC', 'CNCC(=O)NCCCN1C(=O)NC2(CCCC2)C1=O', 'CNC(C)C', 'CC(=O)NCCCN1C(=O)NC2(CCCC2)C1=O', 'CC(C)N(C)CC(N)=O', 'CCCN1C(=O)NC2(CCCC2)C1=O', 'O=C1NC(=O)C2(CCCC2)N1', 'CCCNC(=O)CN(C)C(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C1NC(=O)C2(CCCC2)N1.