['CC1(C)CC2CC(C)(CN2)C1', 'Cc1nccn1S(=O)(=O)N(C)C', 'CN(C)S(=O)(=O)n1ccnc1', 'CN1CC2(C)CC1CC(C)(C)C2']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1c[nH]c(CN2CC3CCCC2C3)n1.