['CC(C)(C)NCC=O', 'CC(C)(CN)N1CCOCC1', 'CC(C)C', 'CC(C)(CNC(=O)CN)N1CCOCC1', 'CC(C)(C)N', 'CC(=O)NCC(C)(C)N1CCOCC1', 'CC(C)(C)NCC(N)=O', 'CC(C)(C)N1CCOCC1', 'C1COCCN1', 'CC(C)CNC(=O)CNC(C)(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1COCCN1.