['CC(C)N(C)C=O', 'CCS(=O)(=O)N1CCN[C@H](C)C1', 'CNC(C)C', 'CCS(=O)(=O)N1CCN(C=O)[C@H](C)C1', 'CCC', 'CCS(=O)(=O)N1CCN(C(=O)NC)[C@H](C)C1', 'CC[SH](=O)=O', 'CC(C)N(C)C(=O)N1CCNC[C@H]1C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CNCCN1.