['CC=O', 'Cn1nncc1S(=O)(=O)N1CCNC2(CCCCC2)C1', 'Cn1nncc1[SH](=O)=O', 'CC(=O)N1CCNCC12CCCCC2']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=S(=O)(c1cnn[nH]1)N1CCNC2(CCCCC2)C1.