['CC(C)(C)NCC=O', 'CN(C)C(CN)c1cccs1', 'CNC', 'CC(C)(C)NCC(=O)NCCc1cccs1', 'CC(C)(C)NCC(N)=O', 'CC(c1cccs1)N(C)C', 'CC(C)(C)N', 'CC(=O)NCC(c1cccs1)N(C)C', 'CC(C)C', 'CN(C)C(CNC(=O)CN)c1cccs1', 'c1ccsc1', 'CN(C)CCNC(=O)CNC(C)(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccsc1.