['CC(C)C(=O)NCCN', 'Cc1ccc(N2C[C@H](C=O)CC2=O)cc1F', 'CC(C)C=O', 'Cc1ccc(N2C[C@H](C(=O)NCCN)CC2=O)cc1F', 'CCNC(=O)C(C)C', 'Cc1ccc(N2C[C@H](C(N)=O)CC2=O)cc1F', 'CC(C)C(N)=O', 'CCNC(=O)[C@@H]1CC(=O)N(c2ccc(C)c(F)c2)C1', 'CC(C)C(=O)NCCNC=O', 'Cc1ccc(N2CCCC2=O)cc1F', 'Cc1ccccc1F', 'CC(C)C(=O)NCCNC(=O)[C@H]1CNC(=O)C1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C1CCCN1c1ccccc1.