['CC(C)(C)NCC=O', 'CC1Oc2ccc(N)cc2NC1=O', 'CC(C)(C)N', 'CC(=O)Nc1ccc2c(c1)NC(=O)C(C)O2', 'CC(C)C', 'CC1Oc2ccc(NC(=O)CN)cc2NC1=O', 'CC(C)(C)NCC(N)=O', 'CC1Oc2ccccc2NC1=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C1COc2ccccc2N1.