['CC(C)C=O', 'NCCNC(=O)NCCc1cccs1', 'CC(C)C(=O)NCCN', 'O=CNCCc1cccs1', 'NCCc1cccs1', 'CC(C)C(=O)NCCNC=O', 'CC(C)C(N)=O', 'CCNC(=O)NCCc1cccs1', 'CCNC(=O)C(C)C', 'NC(=O)NCCc1cccs1', 'CCc1cccs1', 'CC(C)C(=O)NCCNC(N)=O', 'c1ccsc1', 'CCNC(=O)NCCNC(=O)C(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccsc1.