['CC(C)(C)O', 'O=CNCCC(=O)NC1CCN(C2CC2)C1', 'CC(C)(C)OC=O', 'NCCC(=O)NC1CCN(C2CC2)C1', 'NC1CCN(C2CC2)C1', 'CC(C)(C)OC(=O)NCCC=O', 'CC(C)C', 'O=C(O)NCCC(=O)NC1CCN(C2CC2)C1', 'CC(C)(C)OC(N)=O', 'CCC(=O)NC1CCN(C2CC2)C1', 'C1CCN(C2CC2)C1', 'CC(C)(C)OC(=O)NCCC(N)=O', 'C1CC1', 'CC(C)(C)OC(=O)NCCC(=O)NC1CCNC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCN(C2CC2)C1.