['CC(C)(C)NCC=O', 'Nc1ccc2c(c1)NC(=O)CO2', 'CC(C)C', 'NCC(=O)Nc1ccc2c(c1)NC(=O)CO2', 'CC(C)(C)N', 'CC(=O)Nc1ccc2c(c1)NC(=O)CO2', 'CC(C)(C)NCC(N)=O', 'O=C1COc2ccccc2N1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C1COc2ccccc2N1.