['CN(CC=O)S(C)(=O)=O', 'NC1CCN(C2CC2)C1', 'CNS(C)(=O)=O', 'CC(=O)NC1CCN(C2CC2)C1', 'C[SH](=O)=O', 'CNCC(=O)NC1CCN(C2CC2)C1', 'C1CCN(C2CC2)C1', 'CN(CC(N)=O)S(C)(=O)=O', 'C1CC1', 'CN(CC(=O)NC1CCNC1)S(C)(=O)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCN(C2CC2)C1.