['CO', 'N=C(N)SC[C@H]1CC(=O)N(c2ccccc2)C1', 'N=C(N)S', 'COc1ccc(N2C[C@@H](C)CC2=O)cc1', 'CSC(=N)N', 'COc1ccc(N2CCCC2=O)cc1', 'COc1ccccc1', 'N=C(N)SC[C@@H]1CNC(=O)C1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C1CCCN1c1ccccc1.