['C=C(C)C', 'NC(=S)NC1C2CCCC1CN(C1CC1)C2', 'C=C(C)CNC(N)=S', 'C1CC2CC(C1)CN(C1CC1)C2', 'C1CC1', 'C=C(C)CNC(=S)NC1C2CCCC1CNC2']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CC2CC(C1)CN(C1CC1)C2.