['N#Cc1ccsc1N', 'C[C@H]1COCCN1CC=O', 'C[C@H]1COCCN1', 'CC(=O)Nc1sccc1C#N', 'N#Cc1ccsc1', 'C[C@H]1COCCN1CC(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(CN1CCOCC1)Nc1cccs1.