['O=Cc1cc2n(n1)CCO2', 'CC1CNCC(C)S1(=O)=O', 'c1cc2n(n1)CCO2', 'CC1CN(C=O)CC(C)S1(=O)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(c1cc2n(n1)CCO2)N1CCS(=O)(=O)CC1.